Complex sentence: The shore in the area around Cape Billings is bounded by narrow landspits, beach ridges and swales enclosing a series of coastal inshore lagoons, with the De Long Strait lies north of this headland.
Split into simpler sentences: The shore in the area around Cape Billings is bounded by narrow landspits, beach ridges and swales enclosing a series of coastal inshore lagoons. The De Long Strait lies north of this headland.