Complex sentence: Mancheck reveals "Project Scoop," the name of the confidential mission that used the satellite to examine a wormhole that had appeared near Earth, and that the satellite suddenly malfunctioned during its mission, shortly after which the wormhole closed.
Split into simpler sentences: Mancheck reveals "Project Scoop," the name of the confidential mission that had used the satellite to examine a wormhole that had appeared near Earth. The satellite had suddenly malfunctioned during its mission, shortly after which the wormhole closed.