Collocations for complicated - adj.

be, look, seem, sound
It all sounds very complicated.

become, get
This is where the story gets complicated.

extremely, fairly, very, etc.
enormously, extraordinarily, fiendishly, highly, immensely, incredibly, particularly, terribly
The world of finance is fiendishly complicated.

overly, unnecessarily
insanely
increasingly
a little, slightly, etc.

Complicated is used with these nouns:
arrangement, calculation, equation, explanation, formula, machinery, manoeuvre, maths, matter, maze, mechanics, mechanism, mess, picture, plot, problem, procedure, process, puzzle, recipe, relationship, saga, situation, subject, system, task, web, work