Complex sentence: At the age of 20 he took the high school exams and received his high school diploma and continued his education in University of Tehran and worked as a teacher at the same time and managed to achieve his Bachelor of Science in Political science in 1965.
Split into simpler sentences: At the age of 20 he took the high school exams and received his high school diploma and continued his education in University of Tehran and worked as a teacher at the same time. He managed to achieve his Bachelor of Science in Political science in 1965.