Complex sentence: He was re-elected in 2001, filled the vacant seat left by Senator Teofisto Guingona Jr., who was appointed by President Gloria Macapagal Arroyo as Vice President and left the Senate when the term expired in 2004.
Split into simpler sentences: He was re-elected in 2001, filled the vacant seat left by Senator Teofisto Guingona Jr., who was appointed by President Gloria Macapagal Arroyo as Vice President. He left the Senate when the term expired in 2004.