The phrase "complex tangle" refers to a situation or problem that is very complicated and difficult to unravel or solve. It implies that things are twisted, intertwined, or confused. Full definition
But when we analyze it, it turns into a very complex tangle of paradoxes. (nakedpastor.com)
This coming of age produced the most complex tangle of art styles, false starts and movements that had been seen since Paris in the first decade and a half of this century when Impressionism, Post-Impressionism, Fauvism, Cubism, Dada and Surrealism collided. (ronnielandfield.com)
It would get rid of the complex tangle of rules and regulations around benefits better than Universal Credit ever will and chip away at the shadow economy. (politics.co.uk)