Complex sentence: That year, Gwynn pulled the ball with greater regularity, and his 12 homers in 419 at-bats was a higher rate than in 1986 when he hit a then-career high 14 homers in 642 at-bats.
Split into simpler sentences: That year, Gwynn pulled the ball with greater regularity. His 12 homers in 419 at-bats was a higher rate than in 1986 when he hit a then-career high 14 homers in 642 at-bats.