The history screen is new, and looks to be helpful for recreating combos you've discovered
The combo history screen is not new, unless it was removed from the English PSX release (which is possible, I haven't played this game in English since 1998). I just opened a save on my old Vita playthrough to double check, and it was definitely there in the original Japanese game. So, it's either restoring a feature deleted from the English release, or it was always there. Not sure.