It's a pretty complicated ritual and takes some time to prepare for.

A Russian wedding is a complicated ritual that makes no sense to an outsider.

Only humans have devised complicated rituals which convey mystery and respect, along with mourning and tears.

I am quite certain that they are part of some complicated ritual.

They were still wheeling and whirling around each other in a complicated ritual that was the equal of anything a bird could do.

Tea was a luxury drink in the past and involved a complicated ritual - it is polite to use both hands.

Chimpanzees hunted a variety of animals, according to a complicated ritual.

He adjusted to that pretty well, and also learned not to talk when she was going through the complicated secret ritual of getting to sleep.

Evidently approaching the secret crypt of the Teeth was a complicated and elaborate ritual.

The focus on survival prevented the inhabitants from building permanent structures, developing complicated rituals, or amassing extensive personal property.