Complex sentence: In 2012, Carter surpassed Herbert Hoover as the longest-retired president in U.S. history, and he is also the first president to mark the 40th anniversary of his inauguration.
Split into simpler sentences: In 2012, Carter surpassed Herbert Hoover as the longest-retired president in U.S. history. He is also the first president to mark the 40th anniversary of his inauguration.