Complex sentence: November 1981 saw the release of their first single, a cover version of Ralph McTell's "Streets of London", with the song that was to become the group's anthem, "So What" on the B-side.
Split into simpler sentences: November 1981 saw the release of their first single, a cover version of Ralph McTell's "Streets of London". This single later became the group's anthem, "So What" on the B-side.