Complex sentence: Also, it reveals that the three cadets are recruited for another reason which is to be the successors of the Voltron pilots as shown by the fact that Larmina became Allura's successor as the Blue Lion Pilot.
Split into simpler sentences: Also, it reveals that the three cadets are recruited for another reason is to be the successors of the Voltron pilots. As it shown that Larmina became Allura's successor as the Blue Lion Pilot.