Complex sentence: She died in 1997 at the age of 87 but her sister Babs continued to live on the island until her death in 2004, at the age of 86, leaving the island to the Cornwall Wildlife Trust who will preserve it as a nature reserve.
Split into simpler sentences: She died in 1997 at the age of 87 but her sister Babs has continued to live on the island. In 2004, Babs Atkins died at the age of 86, leaving the island to the Cornwall Wildlife Trust who will preserve it as a nature reserve.