Twists and turns; vicissitudes or complications in the course of events—used to describe a complex or troubled process.
会社設立には多くの紆余曲折があったが、ようやく軌道に乗った。
There were many twists and turns in starting the company, but it finally got on track.
彼の人生は紆余曲折に満ちており、それが今の彼を作った。
His life has been full of ups and downs, and that shaped who he is now.
事件の真相にはまだ紆余曲折がありそうだ。
There still seem to be twists and complications regarding the truth of the incident.