Complex sentence: The area is watered by several streams flowing northward to the Waveney and on its southern side are the sources of the River Alde and near Laxfield the principal source of the River Blythe.
Split into simpler sentences: The area is watered by several streams flowing northward to the Waveney. On its southern side are the sources of the River Alde and near Laxfield the principal source of the River Blythe.