Complex sentence: As a rookie, he led the league with seven home runs, becoming the first player to win the league's title, and later led the league with 35 RBI in the 1947-48 season.
Split into simpler sentences: As a rookie, he led the circuit with seven home runs, becoming the first player to win the league's home run title. Finol later led the league with 35 RBI in the 1947--1948 season.