Turn off the the above mentioned circuit at the electrical panel. Plug a lamp or something into each of the outlets to verify they are dead.
Pull each of the receptacles out from their wall boxes. Are the wire connections made on the receptacles or are several wires connected together, inside the box, and only one black and one white wire connects to each receptacle, plus bare ground wire.
If the receptacles are used as a feed through for the wiring I would recommend having at least 2 new 20 amp dedicated branch circuits to be installed. Note dedicated not separate circuits. No shared neutrals.