Assuming operations of the lines is a huge, complex undertaking that will only begin in July.

This, however, can be a rather more complex undertaking if not done properly, as is discussed below.

These questions are next to impossible to answer because coaxing oil out of the ground is an extraordinarily complex undertaking.

Education is a very complex undertaking, which may be why I prefer a system like this, of manageable size.

It was the most complex and costliest undertaking in unmanned space study.

Getting the right technology turned out to be a complex undertaking.

Putting on a music festival, which is a complex undertaking in the best of times, has suddenly become more difficult.

Identifying the specific features of sport is an enormously complex undertaking.

Getting food and money to poor people is a complex undertaking.

Working to reduce poverty in our society is an enormously complex undertaking.