Complex sentence: Despite leading the AAFC in punt return yardage that year, he was waived by the Dons and picked up by the Baltimore Colts, with whom he played in 1949 before retiring from professional sports for good.
Split into simpler sentences: Despite leading the AAFC in punt return yardage that year, he was waived by the Dons. He was then signed by the Baltimore Colts, with whom he played in 1949 before retiring from professional sports for good.