Complex sentence: Part of the River Camel has this name and this flows through the Allen Valley near St Teath and there is also the River Allen north of Truro which meets the River Kenwyn and forms the Truro River.
Split into simpler sentences: Part of the River Camel has this name and this flows through the Allen Valley near St Teath. The River Allen north of Truro meets the River Kenwyn and forms the Truro River.