Complex sentence: Collectors must keep in mind that despite the fact they look almost identical at first sight, Nocton is two inches smaller that Zython, to match the size of all other Big Jim's action figures.
Split into simpler sentences: Collectors must keep in mind that despite the fact both look almost identical at first sight, Nocton is two inches smaller that Zython. His size was reduced to match the size of all other Big Jim's action figures.