Complex sentence: Rheault resided in Owls Head, Maine with his second wife, Susan St. John, married in 1977, ad he adopted two of her children by her previous marriage, Nicholas and Alexis St. John-Rheault.
Split into simpler sentences: Rheault resided in Owls Head, Maine with his second wife, Susan St. John, married in 1977. He had adopted two of her children by previous marriage, Nicholas St. John-Rheault and Alexis St. John-Rheault.