Complex sentence: Torquay's population usually triples between January and end of February, when the school holidays end; the town also hosts end of year Schoolies week celebrations, joint with Lorne, Victoria's most active Schoolies destination.
Split into simpler sentences: Torquay's population usually triples in the period January to the end of February, when the school holidays end. Torquay also helps host Schoolies at the end of every year, joint with Lorne, Victoria's most active Schoolies destination.