A situation (or story) full of upheavals and twists and turns; complicated and eventful.
彼の人生は波乱曲折で、小さな町の出身とは思えない経験をしてきた。
His life has been full of ups and downs; it's hard to believe he came from a small town.
会社の再建は波乱曲折を経て、ようやく黒字になった。
The company's restructuring went through many twists and turns before finally becoming profitable.
このドラマは波乱曲折の展開で視聴者を引きつける。
This drama attracts viewers with its many twists and turns.