1. something with many different components to it
Professional
Social
our new strategy has a lot of moving parts
Complicated machines have a lot of moving parts, the essential working pieces that keep them working; but in this context, 'a lot of moving parts' can refer to the amount of people working in a company, or the number of various departments operating together towards a common goal. It can also refer to numerous aspects of a plan or the processes that come together to make a single thing work successfully.