You really don't want to dumb down ICM, you really want to learn the ins and outs of it. Once you know why ICM applys to certain spots, then you can simplify decisions in game to help you make use of ICM without having to study your ass off.
but you need to know how it works first, before you get into ICM calculators and such.
Recommendations for learning ICM
Dragthebar.com
Has some really good starting videos by zerosum you should check out, after you get through that, you can advance onto other more advanced SNG pros like "casy151" which has some really solid SNG content on there, plus he's a really nice guy and very smart person in general.
Bluefirepoker.com
This also has some really good content by two players Ryan peterson, who has some really good starting out videos that are very worthwhile checking out. ALso some stuff by Raizin Azian is worth checking out for more advanced topics, plus more that have likely been added.
Book reccomendations include
Moshman book(don't know what it's called) but it will have all the basics and most of the background info on ICM and it's relatively cheap compared to the video
poker sites.
If you really want simplified ICM decisions quick, then an expensive option would be to purchase the book "common sense" by 'Glitlr', who was a beast 9man turbo player pre-black friday. His book breaksdown complex ICM decisions and gives you differant ways of utilizing them without knowing all the background info on ICM. It will cost somewhere in the ballpark of around $600, but comes with 4-5 hours of coaching which is included. If you are interested let me know and i can find out for you.
Overall, you are best off learning ICM in depth, most of the SNG regs nowadays have a pretty good knowledge about it, which means you can exploit them by making unorthodox plays, which are essetial to beating anything over the $7 games nowadays.
hope this helps.