Complicated, Complex
な adjective
There are duplicates of everything, not to mention the duplicates are random. Nothing makes sense, and everything is super complicated.
ふくざつ
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
当時、家庭環境が複雑だったので、高校には行っていません。
I didn’t go to high school because my family life was complicated at the time.