Complex sentence: Johnson wanted to go and work at the family company, however his mother wanted him to attend college, so, Uncle Jim, who was then running J&J, proposed that Johnson should go to college and work part-time at the company.
Split into simpler sentences: Johnson wanted to go and work at the family company, however his mother wanted him to attend college. So, Uncle Jim, who was then running J&J, proposed that Johnson should go to college and work part-time at the company.