I'm a great deal better now

In May 1956, during production of Raintree County (1957), Montgomery Clift attended a party at the house of co-star and friend Elizabeth Taylor and her husband Michael Wilding. On his way home from the party —feeling exhausted and having had too much to drink— Clift lost control of his car and smashed into a telephone pole. The actor had a severe concussion, broken jaw, broken nose and other facial injuries, which required surgery and several months of recovery. Clift's face eventually healed, although the left side of his face was left partially paralysed.

At the time of the accident, studio work at MGM had already been completed and the cast and crew of Raintree County were about to go on location to Mississippi. Due to the accident, however, the location shooting was postponed and it wasn't until 23 July that Clift returned to work. Two days earlier he had written a letter to his friend, theater actor William LeMassena, mentioning his recovery, his new dentures and the location shoot. Clift had reportedly been in a relationship with LeMassena during the early 1940s. The two remained close friends until Clift suffered a fatal heart attack in July 1966 (following years of drug and alcohol abuse). At the time of his death, Clift was only 45 years old. 

Source: Gotta Have Rock and Roll

Monty Clift and Liz Taylor on the set of Edward Dmytryk's Raintree County. While the film did well at the box-office —people went to see it en masse, if only to see the difference in Clift's facial appearance before and after the crash— it did not recoup its huge costs.

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Billy LeMassena

Also addressed to William LeMassena is the following letter from Monty Clift several years earlier, dated 5 January 1952. Besides the personal content of the letter —with repeated use of the F-word— Clift fleetingly mentions David Selznick, whom he despised and reportedly called "an interfering f*ckface" behind his back. Clift worked with Selznick on Terminal Station (1953), a film directed by Vittorio De Sica and co-produced by De Sica and Selznick. The actor hated Selznick's interference with De Sica's picture and sided with the Italian director in his disagreements with Selznick. Terminal Station was re-edited by Selznick and in 1954 re-released in the USA under the title Indiscretion of an American Wife. When Clift saw the American cut, he hated it and called it a "big fat failure".

"Eternity" mentioned in the letter is Fred Zinnemann's From Here To Eternity (1953), in which Clift played the role of Private Robert Prewitt. He was the first actor to be hired for the film, with production starting in the spring of 1953. For his performance Clift would receive his third Oscar nomination but didn't win (the other nominations were for The Search (1948) and A Place in the Sun (1951)).

Source: Gotta Have Rock and Roll

Note:

Monty Clift probably misdated his letter, the year being 1953 instead of 1952. Terminal Station was filmed in Rome, Italy from October until December 1952. So it seems likely that the letter was written in January 1953 after production of the film had ended, with Clift being more than eager to go home.

David Selznick and Monty Clift