The party is never so split that you can't split it further.
If this involves independently moving disembodied body parts, all the better.
Leia: Thank god we've ditched those bozos. Let's get out of here!
Luke: Actually, good point.
GM: Okay, you've successfully split the party into... four groups. Troopers emerge behind you.
Luke: R2, directions!
R2-D2: Up the ramp, through the door, and across the Gungan Divorium.
GM: A deep ravine yawns in front of you. There's a bridge...
GM: ... which is also unfinished.
Leia: I close the door behind us.
Obi-Wan: This section was designed by Pete, wasn't it?
R2-D2: No, if I'd designed it, the bridge would now be retracting into the wall.
GM: Troopers appear on a diving platform above you and start shooting.
[SFX]: Pow! Pow!
R2-D2: See, that's more like me.