Complex sentence: During his college years, Hayden traveled around the country, he was in Berkeley for the HUAC demonstrations in 1960, visited the National Student Association headquarters, and participated in a SNCC demonstration in Tennessee for sharecropper's rights.
Split into simpler sentences: During his college years, Hayden travelled around the country and was in Berkeley for the HUAC demonstrations in 1960. He also visited the National Student Association headquarters, and participated in a SNCC demonstration in Tennessee for sharecropper's rights.