untangle
verb [ T ] uk/ʌnˈtæŋ.ɡəl/ us/ʌnˈtæŋ.ɡəl/
(KNOTS)
解开，松开（缠结的线绳、金属线等）
to remove the knots from an untidy mass of string, wire, etc. and separate the different threads
(PROBLEM)
整理，理清（复杂问题）
to make a complicated subject or problem, or its different parts, clear and able to be understood
It took years to untangle the legal complexities of the case. 理清该案牵涉到的复杂法律问题花了很多年的时间。