Complex sentence: The fencing also prevents them from reaching the sea, where they often went to escape biting insects, including mosquitos, and in 1962 several ponies were trapped in an enclosure by high water and died when they were carried out to sea during a storm.
Split into simpler sentences: The fencing also prevents them from reaching the sea, where they often went to escape biting insects, including mosquitos. In 1962 several ponies were trapped in an enclosure by high water and died when they were carried out to sea during a storm.