Complex sentence: There are twenty-six cartridges, termed'Videocarts', that were officially released during the ownership of Fairchild and Zircon, the first 21 of which were released by Fairchild.
Split into simpler sentences: There are twenty-six cartridges, termed'Videocarts', that were officially released during the ownership of Fairchild and Zircon. The first 21 of which were released by Fairchild.