Simplify the following text for a Grade 9 native English-speaking person.
Original: Ratchet & Clank : Going Commando ( known as Ratchet & Clank 2 : Locked and Loaded in certain PAL regions ) is a 3D platformer\/shooter developed by Insomniac Games and published by Sony .
Simplified: Ratchet & Clank : Going Commando ( Ratchet & Clank 2 : Locked and Loaded in Europe , Australia and New Zealand ) is a 3D platform\/shooter for the PlayStation 2 . It was developed by Insomniac Games and published by Sony in 2003 .