The user is alerted by vibrations and by the lights of the telephone and doorbell being on simultaneously.
(The user; is alerted; by vibrations and by the lights of the telephone) (The user; doorbell; being on simultaneously) (The user; being; on; T:simultaneously)
The user The user The user
is alerted doorbell being
by vibrations and by the lights of the telephone
being on simultaneously
on T:simultaneously