Complex sentence: His thinking was influenced heavily by Georgia's maritime geography, which was primarily an uninterrupted series of coastal barrier islands that formed a natural water route, known as the inland passage, offering protection from unpredictable weather and the harsh conditions of the open sea.
Split into simpler sentences: His thinking was influenced heavily by Georgia's maritime geography, which consists of an uninterrupted series of coastal barrier islands. The island chain forms a natural water route, known as the inland passage, which offers protection from unpredictable weather and the harsh conditions of the open sea.