複雑な in English:

Modern finance is becoming increasingly complicated and sophisticated.

I have a complicated matter I want to discuss with you.

This form looks kind of complicated. Help me fill it out.

Math is like love - a simple idea, but it can get complicated.

Things became complicated

In order to be easily understood, a sentence should not be unnecessarily complicated.

Lately the discount airline ticket system has gotten so complicated that there's a lot about it I can't figure out.

Frustrated with the European languages, which he considered "too boring", Christopher Columbus invented "Columbian", a language so complicated that only he could speak it.

To this extent, it has the characteristics of a great complicated balance between plant life and lower forms of animal life.

And though a web looks complicated, it takes a spider little time to make one and catch insects.

The subject is complicated and needs to be looked into further.

Making our environment better to live in shouldn’t need complicated plans. It’s so simple.

I can’t give a simple answer because the situation is very complicated.

Dogs can be trained to do complicated things like assist a person around town or find hidden objects.

Asked about her job, she said, "My job is too complicated to sum up in a word."