Complex sentence: He led the National League in home runs in 1939 with 28, and in 1940 with 43, also leading the league in Runs Batted In in 1940 and 1942.
Split into simpler sentences: He led the National League in home runs in 1939 with 28, and in 1940 with 43. He also led the league in Runs Batted in during 1940 and 1942.