Complex sentence: After his professional career ended, Dobbs became the athletic director at Tulsa in 1955 and held that position until 1970; he was also head football coach from 1961 to 1968.
Split into simpler sentences: After his professional career ended, Dobbs became the athletic director at Tulsa in 1955 and held that position until 1970. Dobbs was also head football coach from 1961 to 1968.