Complex sentence: Seerey led the league in strikeouts four times (1944--46,1948), and was the fifth of 16 players in MLB history who hit four home runs in a single game, doing so for the White Sox on July 18,1948.
Split into simpler sentences: Seerey led the league in strikeouts four times (1944--46,1948). He was the fifth of 16 players in MLB history who hit four home runs in a single game, doing so for the White Sox on July 18,1948.