Complex sentence: In four seasons, Martin scored a career high 7.0 points per game, and shot.452 from the field during the 1974--75 season, when he stepped in for Walton, who missed most of the year with injuries.
Split into simpler sentences: In four seasons Martin never scored more than 7.0 points per game, and he never shot better than.452 from the field. He notched both of those numbers during the 1974--75 season, when Walton missed most of the year with injuries.