1) Alter 2) Change 3) Clear up 4) French word used in English 5) Generalize 6) Make easier to understand 7) Make less complex 8) Modify 9) Oversimplify 10) Streamline 11) Take a broad view 12) To become simpler Found on https://www.crosswordclues.com/clue/simplify
• (v. t.) To make simple; to make less complex; to make clear by giving the explanation for; to show an easier or shorter process for doing or making. Found on http://thinkexist.com/dictionary/meaning/simplify/
Sim'pli·fy transitive verb [ imperfect & past participle Simplified ; present participle & verbal noun Simplifying .] [ Confer French simplifier , Late Latin simplificare . See Simple , and -fy .] To make si... Found on http://www.encyclo.co.uk/webster/S/105