Complex sentence: In 1962 Mair and Eddie Campbell formed the Glasgow band The Beatstalkers, who under the management of Joe Gaffney went on to become Scotland's "top group" at the time.
Split into simpler sentences: In 1962 Mair and Eddie Campbell formed the Glasgow band The Beatstalkers. Under the management of Joe Gaffney, the band went on to become Scotland's "top group" at the time.