Complex sentence: Pluton's most successful year in bodybuilding was 1965 when he won the contests of "Mr. France" (Tall category and Overall) and "Europe Mr. Apollo" (Tall category and overall).
Split into simpler sentences: Pluton's most successful year in bodybuilding was 1965. He won the contests of "Mr. France" (Tall category and Overall) and "Europe Mr. Apollo" (Tall category and overall).