[MLD-Grounds-Keeper-Willie]

I'll give you a general explanation. Gandalf, Merry, Pippin, Gimli, Legolas, and Aragorn are all eventually going to Gondor to fight against the forces of Sauron. They get much needed help. Eowyn, with the help of Merry, defeats the witchking (the lead ringwraith), and Theoden dies. Denethor dies (suicide) and Faramir and Eowyn end up marrying each other. Aragorn claims his kingship of Gondor, and they win at Gondor. Now they go off towards Mordor and fight an outnumbered battle. Pippin kills a troll and the eagles once again come to the aid of the good forces. Meanwhile, Frodo and Sam are on their way to Mt. Doom. They make it and Frodo cannot destroy the ring. Gollum takes it from Frodo but falls in himself and the ring is destroyed. The eagles save Frodo and Sam. Everyone meets again and eventually goes their own ways again. Gandalf escorts the four hobbits to Bree (I think) and then they go back to the Shire. Saruman has taken over the Shire and the four hobbits stir a rebellion to take it back. Grima kill saruman, and then Grima is shot and dies. Sam marries Rose Cotton and has a family. Then Frodo, Bilbo, Gandalf and others sail off to the west. The end.

Hope that helps.