Put at its simplest, the injection molding <e1>machine</e1> contains a <e2>reservoir</e2> of hydraulic oil which is pumped by an electrically- driven pump at high pressure.
Put at its simplest,
Put at its simplest, the injection molding machine contains a reservoir of hydraulic oil which is pumped by an electrically- driven pump at high pressure.
<triplet> machine <subject> reservoir <object> Component-Whole(e2,e1)