Complex sentence: Many of the museum's exhibits were collected on the island's own beaches, and it also owns a considerable collection of Fijian cowries and cones donated by actor Raymond Burr, who owned a shell-strewn island in the Fijis.
Split into simpler sentences: Many of the museum's exhibits were collected on the island's own beaches. The museum also owns a considerable collection of Fijian cowries and cones donated by actor Raymond Burr, who owned a shell-strewn island in the Fijis.