Complex sentence: His most famous song is "Singin' in the Rain," and two of his films won the Academy Award for Best Picture: "An American in Paris" (1951) and "Gigi" (1958).
Split into simpler sentences: His most famous song is "Singin' in the Rain," and two of his films won the Academy Award for Best Picture. Those being "An American in Paris" (1951) and "Gigi" (1958).