Keep is simple.
Short and simple.
Plain and simple
Simple and straightforward.
Simple to understand.
A simple remedy.
Pure and simple.
In simple terms.
A simple task.
Simply done.
Make it simple.
Make it simpler.
“Everything should be made as simple as possible, but not simpler.” – Albert Einstein
“See it big, and keep it simple.” – Wilferd Peterson
“Simplicity is complexity resolved.” – Brancusi