If you describe a sentence, idea, or system as convoluted, you mean that it is complicated and difficult to understand.
例句
Despite its length and convoluted plot, 'Asta's Book' is a rich and rewarding read...虽然篇幅很长，而且情节复杂，但是《阿斯塔的书》仍不失为一部内容丰富、值得一读的作品。The policy is so convoluted even college presidents are confused.这项政策太令人费解，甚至连大学校长们也是一头雾水。
"the Byzantine tax structure""convoluted legal language""convoluted reasoning""intricate needlework""an intricate labyrinth of refined phraseology""the plot was too involved""a knotty problem""got his way by labyrinthine maneuvering""Oh, what a tangled web we weave"- Sir Walter Scott"tortuous legal procedures""tortuous negotiations lasting for months"