I've found that once you learn a complex concept, and then add its constituent parts to anki, you will still retain the concept as long as you review the simple stuff. You can also do it the other way: learn the parts and then play with them in your head to learn the concept. Adding some redundancy, i.e. reviewing the same facts in many types of questions helps.

Also Anki has really taught me that any "conceptual understanding" can still be reduced into simple parts.