Complex sentence: In 1972, The Doors released "Get Up and Dance" as a single in the UK; the B-Side was the non-album "Tree Trunk", one of only three non-album studio tracks released by the band.
Split into simpler sentences: In 1972, The Doors released "Get Up and Dance" as a single in the UK, the B-Side was the non-album "Tree Trunk". The song is one of only three non-album studio tracks released by the band.