If your piping is plastic and you want to lower it, its easy. You can cut the plastic with a reciprocating saw and a plastic cutting blade. Typically that a blade with 10 to 12 teeth per inch. You can use a slip pvc (or abs) coupling to reconnect the pipes together. But before all that, you can use a deep trap, if you need to or a low inlet trap. A low inlet trap allows you to connect 2 inches lower than a standard trap. In addition if your using a disposal, you can come straight out of the disposal (instead of turning down) into the tee from a disposal continous waste kit. Specially designed continous waste kits to tie in higher. You use a standard flanged tail piece to come out of the disposal and go directly into the tee from the other compartment. The tee sits on top of the trap. This prevents you from having to go lower. Another thing you can do is to cut the pipe coming out the wall and install a wye and use two traps for each compartment. One trap for the disposal and one for the second sink compartment. This also allows you to stay higher.