Complex sentence: Also, he was considered one of the better defensive first baseman of the 1960s; he led the league in putouts (1961), fielding percentage (1964,1967) and assists (1965-67).
Split into simpler sentences: Also, he was considered one of the best defensive first baseman in the 1960s. He led the league in putouts (1961), fielding percentage (1964,1967) and assists (1965-67).