To become complicated or intricate; used when things like roads, structures, or situations interweave and become hard to untangle.
古い町は路地が入り組んでいて、初めてだと迷いやすい。
The old town's alleys are so convoluted that it's easy to get lost on your first visit.
事件の背景が入り組んでいて、真相を突き止めるのは難しい。
The background of the incident is complicated, so uncovering the truth is difficult.
配線が入り組んでいるので、工事には時間がかかりそうだ。
The wiring is tangled and complicated, so the work will probably take time.