Complex sentence: However, in 1955, he became the club's regular receiver, playing in 124 games and compiling a career-high 326 at bats, but his batting average plummeted to.215 and he spent the rest of his MLB career as a back-up.
Split into simpler sentences: However, in 1955, he became the club's regular receiver, playing in 124 games and compiling a career-high 326 at bats. But his batting average plummeted to.215 and he would spend the rest of his MLB career as a back-up.