Complex sentence: Supreme Knight Hart attended a banquet in the Cuban Prime Minister's honor in April of that year sponsored by the Overseas Press Club and later sent him a letter expressing regret that they were not able to meet in person.
Split into simpler sentences: Supreme Knight Hart attended a banquet in the Cuban Prime Minister's honor in April of that year sponsored by the Overseas Press Club. He later sent him a letter expressing regret that they were not able to meet in person.