Complex sentence: Summer's Lease has made famous the Piero Della Francesca Trail, which sees Molly set out from the Chianti District near Siena and travel to the following places to view the art work of Piero Della Francesca.
Split into simpler sentences: Summer's Lease has made famous the Piero Della Francesca Trail. In the story Molly sets out from the Chianti District near Siena and travels to the following places to view the art work of Piero Della Francesca.