Complex sentence: The river receives Bouquet Creek, Placerita Creek, and San Francisquito Creek within the city of Santa Clarita, though in practice the river remains dry most of the year, except on extreme occasions of heavier than average rainfall.
Split into simpler sentences: The river receives Bouquet Creek, Placerita Creek, and San Francisquito Creek within the City of Santa Clarita. The riverbed surface remains dry most of the year here, except on extreme occasions of heavier than average rainfall.