就是简单句
你给出的这两个句子就是简单句了.如果要改那就改成The young man jumped into the river tosavethe little boy.
这要看情况,如果and前后连接的是两个句子那就不能算了.另外to是一个介词不是连词,至于and我举个例子吧.He goes to school and finds his teacher,这里虽然用了and,但仍是一个简单句,因为and后面不是句子.而He goes to school and he finds his teacher,这就不是一个简单句了,后面跟了一个句子.
希望采纳谢谢