Complex sentence: Dan Aykroyd said he developed the idea for the Coneheads based on the Moai, the mysterious and ancient stone statues of Easter Island, which have similarly conical heads, and the people of the land of Points from Harry Nilsson's "The Point!".
Split into simpler sentences: Dan Aykroyd said he developed the idea for the Coneheads based on the Moai, the mysterious and ancient stone statues of Easter Island, which had similarly conical heads. And the people of the land of Points from Harry Nilsson's "The Point!".