Complex sentence: The River Medina flows north into the Solent, the Eastern Yar flows roughly northeast to Bembridge Harbour at the eastern end of the island, and the Western Yar flows the short distance from Freshwater Bay to a relatively large estuary at Yarmouth.
Split into simpler sentences: The River Medina flows north into the Solent, whilst the other main river, the Eastern Yar, flows roughly northeast, emerging at Bembridge Harbour at the eastern end of the island. There is another river in the west of the island called the Western Yar, flowing the short distance from Freshwater Bay to a relatively large estuary at Yarmouth.