BFRPG is awesome indeed, and has some amazing free supplements.
Not really "close to 5e", IMO.
Still, great game.
I don’t think there is a 5E clone.
However, the OP has changed. Now it’s just a D&D style game that’s easier than 5E.
I already consider 5E about medium complexity. Crunchier ones are AD&D 1&2, maybe even the Pathfinder games, while easier are all the White Box or B/X stuff. Basic Fantasy is a B/X style game.
I also recommend Dungeons & Delvers Dice Pool edition. It uses a dice chain system. Everything starts as a 1D4, then upgraded to a 1D6, 1D8, 1D10, and maxes out as a 1D12. All dice rolls are your attribute dice plus a skill dice, and often some additional dice from class or racial bonuses, roll ‘em all, and add up the best two dice. It’s really simple.