Complex sentence: Then in 1973, Jeremy got an Oscar for Best Original Screenplay for his script of "The Candidate"... an award he had never remotely imagined... and this may have been the first sign that the movie would eventually become a classic.
Split into simpler sentences: Then in 1973, Jeremy got an Oscar for Best Original Screenplay for his script of The Candidate. This may have been the first sign that the movie would eventually become a classic.