Complex sentence: The Odyssey uses a type of removable printed circuit board, called a game card, that inserts into a slot similar to a ROM cartridge slot; these do not contain any components but have a series of jumpers between pins of the card connector.
Split into simpler sentences: The Odyssey uses a type of removable printed circuit board, called a game card, that inserts into a slot similar to a ROM cartridge slot. The game cards do not contain any components, but have a series of "jumpers"-simple electrical connections-between pins of the card connector.