untangle
US /ʌnˈtæŋ.ɡəl/
UK /ʌnˈtæŋ.ɡəl/

1.
undo or unravel (something tangled)
:
•
She carefully tried to untangle the knot in her necklace.
•
It took a long time to untangle the fishing lines.
2.
resolve (a complicated or confused situation)
:
•
The detective worked to untangle the complex web of clues.
•
It's hard to untangle all the issues in this dispute.