Complex sentence: Lake Memphremagog is mentioned in a novel by Chris Bohjalian, "Close Your Eyes, Hold Hands", in which the lake is the site of a nuclear reactor that has suffered a cataclysmic meltdown.
Split into simpler sentences: Lake Memphremagog is mentioned in a novel by Chris Bohjalian, Close Your Eyes, Hold Hands. In the novel, the lake is the site of a nuclear reactor that has suffered a cataclysmic meltdown.