Simplify the following text for a Grade 7 native English-speaking person.
Original: The capture of Iwo Jima would eliminate these problems and provide a staging area for the eventual invasion of the Japanese mainland .
Simplified: The Battle of Iwo Jima was the American capture of island of Iwo Jima from the Japanese during the Pacific Campaign of World War II . The USA need to capture Iwo Jima to be able to capture Japan if they needed to .