Better opening than Ruy Lopez Exchange? I currently use the Ruy Lopez Exchange (1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6). Is there a simpler and/or better opening to use instead?
"Simpler" is somewhat subjective. You could argue that learning a system like the King's Indian Attack is simpler because you can play it irrespective of what black plays, while playing the Ruy Lopez Exchange requires your opponent to cooperate to some extent as at any move there are perfectly fine alternatives.

The Ruy Lopez Exchange variation is not the most popular line at the highest level, but there is nothing wrong with it. If you are happy with it and like the positions you get out of it, there is no reason to change.

If you are not happy with it, you could analyze yourself, what kind of positions you like. Perhaps compare positions you get out of different openings (e.g. around move 15) and see which you like best.