The leads to the commutator send current running through the wires wrapped around the nails, and convert those nails into electromagnets with poles.
(The leads to the commutator; send; current running) (the wires; wrapped; ) (The leads to the commutator; convert; those nails; into electromagnets with poles)
The leads to the commutator the wires The leads to the commutator
send wrapped convert
current running
those nails into electromagnets with poles