It doesn't look too bad. The white thing is the SMJ and bolts into the engine harness that goes around the front left fender. The relays are accessories relays.
If you want to get familiar with the wiring, I recommend removing the entire body harness and "engine room" harness. You can leave anything that plugs into the ECU and the engine intact, but everything else can come out.
Then get an FSM and trace out all the wire colours. Fix what needs fixing and reroute the fender harness into the engine bay for best protection.
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