Odd career transformation

https://www.baseball-reference.com/register/player.fcgi?id=furill001car

Never hit for power, majors or minors until age 27, when he hit 18 home runs and continued to hit 20 home runs a year for the rest of his career. Previous high in pro homers was 10, which he did in B ball. Had hit 4 dingers in 364 at bats the previous year at 26.