Complex sentence: A regular at London's Comedy Store, John has appeared at venues all around the globe from Melbourne to Edinburgh; from the prestigious Just For Laughs and Halifax Festivals in Canada, to The Liffey Laughs in Dublin.
Split into simpler sentences: A regular at London's Comedy Store, John has appeared at venues from Melbourne to Edinburgh. He appeared at the Just For Laughs and Halifax Festivals in Canada and Liffey Laughs in Dublin.