Complex sentence: Hammond allows SG-1 to return to the planet where Malikai feigns ignorance, but he makes a slip when the altar activates, and a flash transports O'Neill back to breakfast.
Split into simpler sentences: Hammond allows SG-1 to return to the planet where Malikai at first feigns ignorance. Malikai makes a slip when the altar activates, and a flash transports O'Neill back to breakfast.