Tom went to college. His brother

Tom went to college. His brother James didn’t. James had a very weak heart. (compound-complex sentence )
【正确答案】：Tom went to college, but his brother, James, didn’t because James had a very weak heart.
【题目解析】：本题采用并列连词和从属连词连接的方法，把三个简单句连接成一个并列复合句的方法来完成。