SMN really isn't a rotation, honestly. It's simply a priority system. Out side of your opening burst rotation (this is the one place where you have a scripted order of operation), you just make sure your DoTs are always up, puddle is down, you're not wasting/losing aetherflow stacks, and you use painflare at the end of DWT.

Now, as far as your opening... well, that's up to you. How complex do you want to get? You said you wanted easy, so here's something passable:

Raging Strikes > Bio II > Miasma > Bio > Fester > Quickcast > Shadowflare > [3 Pet Cooldowns] > Tri-Disaster > Fester > Miasma II > Contagion

This is very close to our pre-3.0 opening. It's not optimal, but it'll get you by for now. If you really want to play SMN in end-game raid content, you'll need to look into the other more complex openers.