Complex sentence: He became a member of the Atlanta Falcons in 1973, after unable to reach a contract agreement with the Vikings, where he played in all fourteen games in both 1973 and 1974 before retiring.
Split into simpler sentences: He became a member of the Atlanta Falcons in 1973, after being unable to reach a contract agreement with the Vikings. He played for the Falcons in all fourteen games in both 1973 and 1974 before retiring.