The 2005 version of Star Wars: Battlefront II (often called BF2 2005 or Classic) natively supports split-screen on consoles (PS2, Xbox, PSP), but the PC port originally shipped without this feature enabled.
Restoring Localized Multiplayer: A Technical and Cultural Analysis of the Split-Screen Mod for Star Wars: Battlefront II (2005) star wars battlefront 2 2005 split screen pc mod
Configure the number of players and assign your gamepads to specific screen positions. The 2005 version of Star Wars: Battlefront II