adjective

(especially of an argument, story, or sentence) extremely complex and difficult to follow.

the film is let down by a convoluted plot in which nothing really happens

complicated,complex,involved,intricate,elaborate,impenetrable,serpentine,labyrinthine,tortuous,tangled,Byzantine,Daedalian,Gordian,confused,confusing,bewildering,baffling,puzzling,perplexing,fiddly,plotty,involute