convoluted

1. ADJ If you describe a sentence, idea, or system as convoluted, you mean that it is complicated and difficult to understand. 晦涩的; 复杂的[正式]

Despite its length and convoluted plot, "Asta's Book" is a rich and rewarding read. 虽然《阿斯塔的书》篇幅冗长、情节复杂，但不失为一本丰富及有益的读物。