National environmental groups have a complicated history with natural gas.

Finding the right candidate will be a challenge, given the division's complicated history.

The organization has several predecessor organizations and a complicated history.

The organ has a complicated history and was restored in 1997.

The concept of relation has a long and complicated history in philosophy.

Although the surviving school building as of much later date, it has a fairly complicated history.

But the ballet has had a complicated history ever since.

She may have had a long and complicated history before that.

The fabric patterns, by the way, have a complicated history of their own.

The site on which it was built has a complicated history.