Complex sentence: Its name is derived from being situated on the northern reach of what was once called the River Fleet (today known as the Ebbsfleet) there is a village at the other end of the river named Southfleet.
Split into simpler sentences: Its name is derived from being situated on the northern reach of what was once called the River Fleet (today known as the Ebbsfleet). There is a village at the other end of the river named Southfleet.