If it was a horror or suspense type comic, I'd suggest looking at series like Ruby Quest, which uses a simple art style very effectively.
The problem is, action is an extremely challenging genre to draw. When you look at some well-received action focused comics like the Scott Pilgrim series, Nextwave: Agents of HATE, or Hellboy, the art is relatively simple and uncluttered, but it's also very, very clear with these dynamic angles and a sense of depth. If you remove too much detail, it'll get hard to tell characters apart or use elements of the character design to communicate angle, tension, momentum etc.
Example of Hellboy action by Mike Mignola:
Scott Pilgrim by Bryan Lee O'Malley
Nextwave: Agents of HATE, art by Stuart Immonen
On all three of these, the art is actually relatively simple in terms of how many lines are on the characters and the level of detail on clothes and faces, the amount of detail in backgrounds etc. specifically because the angles and poses being drawn are so challenging and it's so vital to get across the spacial relationship
Really the big question is WHY you'd want to draw an action comic if you don't want to work really hard? If you want to draw something with simple art, make a horror comic, or a simple comedy gag thing or slice of life. Action is all about visual spectacle, like that's the whole reason to draw it.
I draw an action comic and I have to keep the style fairly simple, because I draw two of these every week. This is what just half a weekly update looks like:
If the style was much simpler, it'd start to be like "why am I making this?" Action comics, the drawings have to do so much of the heavy lifting; the narration and dialogue can't take the brunt of the work, so to make an action comic that people actually want to read, you have to work hard at drawing something that looks really exciting and reads very clearly.
About the simplest I could possibly imagine working while still looking good enough that it could reliably build an audience, would be something like from a lower budget action cartoon, like say Netflix She-Ra:
Which is really kind of similar to how my work would look if I switched to a consistent width pen for inking and stopped doing so much fold detail on clothes or as many lines on hair and stuff.
Or something like Scott Pilgrim, which was a solo-created action comic series, so worth a look:
But you can see that Scott Pilgrim, the detail on characters is simple, and it uses chunky brushed inks and black fills and screentones to fill space, but O'Malley still doesn't skimp on background detail, and his choice of angles for shot composition is extremely strong.
Action styles should be simple so that everything reads well, but that means that to do a good job, you'll have to be very confident about your grasp of anatomy and perspective, because you just can't get away without drawing full bodies in tricky poses or drawing multiple people in panels. Definitely not an easy genre to pick if you want something quick and easy to draw! 
