Complex sentence: Born in Carlisle, England, but brought up by his Scottish family in Glasgow and Troon, Ayrshire, Morton's early years were characterised by committed evangelical Christianity, a subject later dealt with in his writing, notably the novel "Red Guitars in Heaven".
Split into simpler sentences: Born in Carlisle, England, but brought up by his Scottish family in Glasgow and Troon, Ayrshire, Morton's early years were characterised by committed evangelical Christianity. This subject is dealt with in his writing, notably the novel "Red Guitars in Heaven".