Complex sentence: Mondo played his last gig with Death Cult on 19 September 1983 at the Brixton Ace in London, and shortly afterwards he essentially "swapped" places with drummer Nigel Preston (who had previously worked with Duffy in Theatre of Hate).
Split into simpler sentences: Mondo played his last gig with Death Cult on 19 September 1983 at the Brixton Ace in London. Shortly afterwards, he essentially "swapped" places with drummer Nigel Preston (who had previously worked with Duffy in Theatre of Hate).