Is there anyway to simplify these schematics??

Which game? It really depends on the age of the schematic. Back in the '70's and early '80's many companies just made it up as they went along.
 
The game has 6 boards because the manufacturer couldn't (or wouldn't) put all of the chips and stuff onto one board. The split is probably across functional lines (many systems put the sound out onto a separate board), but the exact function of each board may not be immediately apparent.

As to why 6 boards instead of 2 or 1 - in all likelyhood the manufacturer was either re-using parts from other systems (or planed to do so), OR they were nervous about building larger boards. The larger the PCB, the more likely it is that flexing of the board is going to give you trouble. Obviously you can go pretty big before that happens, but in the early days not everyone knew where the limits really where.
 
The game has 6 boards because the manufacturer couldn't (or wouldn't) put all of the chips and stuff onto one board. The split is probably across functional lines (many systems put the sound out onto a separate board), but the exact function of each board may not be immediately apparent.

As to why 6 boards instead of 2 or 1 - in all likelyhood the manufacturer was either re-using parts from other systems (or planed to do so), OR they were nervous about building larger boards. The larger the PCB, the more likely it is that flexing of the board is going to give you trouble. Obviously you can go pretty big before that happens, but in the early days not everyone knew where the limits really where.

The case that holds the boards is huge!!! I was wondering why it was so big until I saw the manual.
 
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