Fundamentally, it is (was?) very simple---the basic rules were in two pocket games. Characters had three basic characteristics, strength (also a proxy for endurance and damage tolerance), dexterity, and intelligence, plus skills and assorted other
I managed to miss Rolemaster, although I liked the titles, particularly "Claw Law." :-) But I know what you mean about complexity; too much "realism" leads to things like Ben Sergeant's Car Wars cartoon (lower left, here https://i.ebayimg.com/images/g/HSYAAOSwTglYlP-b/s-l300.jpg): "My goodness! 08:00:06, already?"
The TFT wiki page says, "A revival of TFT and associated MicroQuest adventures is underway at http://www.darkcitygames.com.*" The "Legends" rules (http://www.darkcitygames.com/docs/Legends.pdf) [PDF] there look a lot like the basic mechanics of TFT.
I managed to miss Rolemaster, although I liked the titles, particularly "Claw Law." :-) But I know what you mean about complexity; too much "realism" leads to things like Ben Sergeant's Car Wars cartoon (lower left, here https://i.ebayimg.com/images/g/HSYAAOSwTglYlP-b/s-l300.jpg): "My goodness! 08:00:06, already?"