Complex situations overwhelm us, so we avoid them.  They overwhelm everyone else.

Size and strength, and then ruthlessness in business used to be what life rewarded.  Nowadays, those who are comfortable in complex situations get the best rewards in life.

Accept that you will never understand everything about a situation.  Do as much thinking as you can, to understand what's really happening.

With this, you can outdo others and, over time, become comfortable with complexity.