The phrase "simple layman" refers to a person who does not have special knowledge or expertise in a certain subject. They have a basic understanding of things and are not experts in the field. Full definition
Can anyone tell me in simple layman terms how to get the e-books I've just paid premium (read: more than paperback price!) (goodereader.com)
Mortgage refinancing, in simple layman terms, refers to the process of obtaining a new secured loan to repay an existing mortgage loan on the same property. (loans.net)
Commenter Chuck Knucka broke it down into simpler layman terms, posting: «While the last Tomb Raider was certainly fun, it's not the kind of game I'm drooling to play. (techradar.com)