Complex sentence: Inside the bunker a cellphone is brought in by Isabel Cristina, who was unconscious at the time, the phone receive a call, this is intercepted by a spy plane from which gives the order to keep operating.
Split into simpler sentences: Inside the bunker a cellphone is brought in by Isabel Cristina, who was unconscious at the time. The phone receives a call, and is intercepted by a spy plane which gives the order to keep operating.