Complex sentence: Morro Rock is a volcanic plug located just offshore from Morro Bay, California, at the entrance to Morro Bay Harbor, and a causeway connects it with the shore, effectively making it a tied island.
Split into simpler sentences: Morro Rock is a volcanic plug located just offshore from Morro Bay, California, at the entrance to Morro Bay Harbor. A causeway connects it with the shore, effectively making it a tied island.