Complex sentence: Dykes' bunker is equipped with a ventilation pipe; hostage negotiators have used the pipe to communicate with Dykes and he has allowed prescription medication for Ethan to be passed through it.
Split into simpler sentences: Dykes' bunker is equipped with a ventilation pipe. Hostage negotiators have used the pipe to communicate with Dykes, who has allowed prescription medication for Ethan to be passed through it.