Complex sentence: Following the election of President Jimmy Carter, in 1977 Hyland left government service, working at the Center for Strategic and International Studies at Georgetown University and at the Carnegie Endowment for International Peace.
Split into simpler sentences: Following the election of President Jimmy Carter, in 1977 Hyland left government service. He worked at the Center for Strategic and International Studies at Georgetown University and at the Carnegie Endowment for International Peace.