Complex sentence: The collection currently contains the last two remaining SRN4 crafts, the worlds largest hovercrafts, the future of these crafts is uncertain as they are still owned by Hoverspeed the cross channel company and still up for sale.
Split into simpler sentences: The collection currently contains the last two remaining SRN4 crafts, the worlds largest hovercrafts. The future of these crafts is uncertain, as they are still owned by Hoverspeed, the cross channel company and still up for sale.