How does a person get out of a morass of personal complexity or entanglement?

It's not easy. First, you have to decide what parts of that morass are holding you down and keeping you from being your best self. Once you've figured that out, you need to decide how to get rid of those things in your life. This may mean breaking off relationships with unhealthy people who are just making you feel bad or getting you into trouble.

Take it one step at a time - don't try to get rid of everything all at once, but do a little bit, then a little more, and soon you'll be feeling much better.