Complex sentence: Relations with the United States suffered when Alfonsín terminated the previous regime's support for the Contras, and two meetings with U.S. President Ronald Reagan failed to ease Reagan's opposition to economic concessions towards Argentina.
Split into simpler sentences: Relations with the United States suffered when Alfonsín terminated the previous regime's support for the Contras. Two meetings with U.S. President Ronald Reagan failed to bring economic concessions towards Argentina.