Simplify the following text for a Grade 6 native English-speaking person.
Original: An elephant gun is a large caliber gun , rifled or otherwise , so named because they were originally developed for use by big-game hunters for elephants and other large dangerous game .
Simplified: An elephant gun is a large caliber gun , which could be ( but does not have to be ) a rifle . Elephant guns were first made to be used by big-game hunters who were hunting elephants and other large animals . .