Complex sentence: The Alhambra seats up to seven people--the 5 rear seats being all movable or even removable leaving a flat-load floor--a unique feature in SEAT vehicle range at that time.
Split into simpler sentences: The Alhambra seats up to seven people--the 5 rear seats being all movable. They can also be removed to leave a flat-load floor--a unique feature in SEAT vehicle range at that time.