Simple
noun, な adjective
Simple and pure. This is simple.
たんじゅん
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
日本語で単純な文章なら作れますが、難しいのはまだ無理です。
I can make up simple sentences in Japanese, but I can’t do complicated ones yet.