Complex sentence: Wendell received a Series 7 stockbroker's license in 1977, went to work for his dad, did not like it and the family business ended in 1984, when he refused to keep it going.
Split into simpler sentences: Wendell received a Series 7 stockbroker's license in 1977, and was employed by his father. He did not like it and the family business ended in 1984, when he refused to keep it going.