1.  Helicopters, too, are complicated things and pose many problems.

2.  Of course, complicated things consist of lots of simpler things.

3.  Plant and animal cells are complicated things.

4.  The proper awareness required to appreciate the swarm nature of complicated things might be called hive mind.

5.  On the other hand, the world was miles across and full of complicated things.

6.  We animals are the most complicated things in the known universe.