Complex sentence: In 2008, the Coast Guard replaced the original Fresnel light with a replaceable plastic beacon mounted outside the lantern room, but the original Fresnel lens remains in the lantern room where it can be viewed by visitors.
Split into simpler sentences: In 2008, the Coast Guard replaced the original Fresnel light with a replaceable plastic beacon mounted outside the lantern room. The original Fresnel lens remains in the lantern room where it can be viewed by visitors.