Complex sentence: Cassandra was later found by SG-1, who brought her back to Earth, where she was soon found to contain the explosive elements of Nirrti's human bombs and it was only due to the quick thinking of Carter that Stargate Command wasn't completely destroyed.
Split into simpler sentences: Cassandra was later discovered by SG-1, who brought her back to Earth. There, she was soon found to contain the explosive elements of Nirrti's human bombs, and it was only due to the quick thinking of Carter that Stargate Command was not completely destroyed.