I’ve written previously on various aspects of complexity (eg here) as it’s an interest of mine (I did data visualisation in this area quite a while ago when I worked at the IBM Scientific Centre in Winchester, see below).
One post, from 2009, gave an overview poster for the development of the key ideas starting from the 1940-50s and ending at 2009 with Web Science (see below).
I’ve just checked to see if there is an updated version and here it is (up to 2018):
There’s another recent poster for the techniques used to handle complex systems. I’ve found it helpful to use such perspectives to think through problems (even if you are not an expert in the methods) as they can motivate new insights simply through a fresh way of looking at things.