是一个and 链接的并列句。
There were other boats from the other beaches going out to sea
and
the old man heard the dip and push of their oars even though he could not see them now.
The moon was below the hills.
最后一句应该是独立成句的，因为没看到有连词啊。原句里面用and连接了两个主句，互为并列关系。结构图如上，还需要继续解释吗？剩下的结构楼主自己能解决了吧？
内容全部来源于网络收集，如有侵权，请联系网站删除：QQ：24596024