Complex sentence: The Dominicans began building the present Gothic church in 1280, modelling it on their church in Florence, Santa Maria Novella, and following plans probably drawn up during the pontificate of Nicholas III by two Dominican friars, Fra Sisto Fiorentino and Fra Ristoro da Campi.
Split into simpler sentences: The Dominicans began building the present Gothic church in 1280 modelling it on their church in Florence, Santa Maria Novella. Architectural plans were probably drawn up during the pontificate of Nicholas III by two Dominican friars, Fra Sisto Fiorentino and Fra Ristoro da Campi.