Example : The Byzantine tax structure.
Byzantine methods for holding on to his chairmanship.
Convoluted legal language.
Convoluted reasoning.
The plot was too involved.
A knotty problem.
Got his way by labyrinthine maneuvering.
Oh, what a tangled web we weave.
Tortuous legal procedures.
Tortuous negotiations lasting for months.

Synonyms : byzantine, convoluted, involved, knotty, tangled

Example : A tortuous road up the mountain.
Winding roads are full of surprises.
Had to steer the car down a twisty track.

Synonyms : twisting, twisty, voluminous, winding

Example : His tortuous reasoning.