Simplify the following text for a Grade 7 native English-speaking person.
Original: In the 1970s , Bishara attended the Hebrew University in Jerusalem , was the head of the Arab Student Union , and was also active in the Jewish-Arab student group Campus .
Simplified: In the 1970s , Bishara studied at the Hebrew University in Jerusalem . He was the head of the Arab Student Union and was active in the Jewish-Arab student group Campus .