Complex sentence: Newell played with the Barons (later renamed Son Richard and the Chessmen) from 1961 to 1965, followed by a stint with the Midknights and in the summer of 1969 helped to form And Many Others, which was Ronnie Hawkins's backing band at that time.
Split into simpler sentences: Newell played with the Barons (later renamed Son Richard and the Chessmen) from 1961 to 1965 and then with the Midknights. In the summer of 1969 helped to form And Many Others, which was Ronnie Hawkins's backing band at that time.