Complex sentence: Duncan would later compete in CBS reality series' and finished in 9th place, she would later participate in an another CBS reality series "The Amazing Race 25" with her fellow "Survivor" contestant and fiancé Keith Tollefson, they finished in 8th place.
Split into simpler sentences: Duncan would later compete in CBS reality series' and finished in 9th place. She would later participate in another CBS reality series "The Amazing Race 25", with her fellow "Survivor" contestant and fiancé Keith Tollefson; they finished in 8th place.