Complex sentence: This was the first time that the Nintendo DS version of the Rumble Pack was introduced; it was first sold exclusively with "Metroid Prime Pinball" before it became available as a standalone product from Nintendo.
Split into simpler sentences: This was the first time that the Nintendo DS version of the Rumble Pack was introduced. It was first sold exclusively with "Metroid Prime Pinball" before becoming available as a standalone product from Nintendo.