Simplify the following text for a Grade 9 native English-speaking person.
Original: The armature is another set of coils wound round a central shaft and is connected to the field windings through `` brushes '' which are spring loaded contacts pressing against an extension of the armature called the commutator .
Simplified: The armature is connected to the field windings through brushes . The brushes are spring loaded contacts pressing against the commutator .