Their communication may be much more complex than we thought. ✬

What seems simple to you seems complex to me. ✬

The explanation may be much more complex. ✬

This story is too complex for children. ✬

Life today is fast-moving and complex. ✬

Do you know anything about complex carbohydrates? ✬

How complex is it? ✬

Tom's explanation was too complex. ✬

A computer's electronics are very complex. ✬

Chemistry can be very complex. ✬