Complex sentence: However, Amy learns through the calendar that the pyramid is a giant stone spacecraft, able to hold 30,000 people as the Planet Express group is caught by Zapp Brannigan and brought before President Richard Nixon.
Split into simpler sentences: However, Amy learns through the calendar that the pyramid is a giant stone spacecraft, able to hold 30,000 people. Upon returning to the spacecraft, the Planet Express group is caught by Zapp Brannigan and brought before President Richard Nixon.