Name a "simpler" RPG. There will be some people who will be playing it. If simpler matters to you... join them in playing that game.
But if you choose D&D, it's because you wish to play D&D... not because you have some mythical level of simplicity/complexity you are aiming for and are selecting a game that equals it. No one comes into the RPG hobby with complexity being their defining target and then just happens to settle upon D&D as the answer to their question after reviewing a dozen different games. Rather, they come to D&D first... and then after the fact comes to the conclusion they want something simpler or something more complex and then moves on to a different system.
But if you choose D&D, it's because you wish to play D&D... not because you have some mythical level of simplicity/complexity you are aiming for and are selecting a game that equals it. No one comes into the RPG hobby with complexity being their defining target and then just happens to settle upon D&D as the answer to their question after reviewing a dozen different games. Rather, they come to D&D first... and then after the fact comes to the conclusion they want something simpler or something more complex and then moves on to a different system.