Complex sentence: The expansion was included in the "Fallout 4" season pass, a collection of all the expansion packs, and due to the large amount of additional content, the price rose from US $30 to $50.
Split into simpler sentences: The expansion was included in the "Fallout 4" season pass, a collection of all the expansion packs. Due to the large amount of additional content, the price for the pass was increased from US $30 to $50.