Complex sentence: His first major critical success came portraying Tom Hagen in "The Godfather" (1972) and "The Godfather Part II" (1974), the 1972 film earning him an Academy Award nomination for Best Supporting Actor.
Split into simpler sentences: His first major critical success came portraying Tom Hagen in "The Godfather" (1972) and "The Godfather Part II" (1974). The film earned him an Academy Award nomination for Best Supporting Actor.