Complex sentence: From 1976 to 1992, the U.S. Department of Energy funded the Eastern Gas Shales Project, which studied many eastern shale formations, drilled and cored five wells in the Marcellus in Pennsylvania.
Split into simpler sentences: From 1976 to 1992, the U.S. Department of Energy funded the Eastern Gas Shales Project, which studied many eastern shale formations. The project drilled and cored five wells in the Marcellus in Pennsylvania.