Complex sentence: She was re-elected in 1998 and 2000, forgoing a fourth term to run for the United States Senate in 2002, losing to Republican John E. Sununu.
Split into simpler sentences: She was re-elected in 1998 and 2000. Instead of seeking a fourth term as governor, she opted to run for the United States Senate in 2002, losing to Republican John E. Sununu.