Complex sentence: He continued his studies at the University of Newcastle upon Tyne where he was awarded a Bachelor of Arts degree in politics in 1992 and was also elected president of the students' union in 1991, the year he joined the Liberal Democrats.
Split into simpler sentences: He continued his studies at the University of Newcastle upon Tyne, and gained a Bachelor of Arts degree in politics in 1992. He was elected president of the students' union in 1991, the year he joined the Liberal Democrats.