Became separated (5,2)
I believe the answer is:
split up
(Other definitions for split up that I've seen before include "Part company" , "Parted company" , "Separate" , "Divorce" , "Take apart" .)
I believe the answer is:
split up
(Other definitions for split up that I've seen before include "Part company" , "Parted company" , "Separate" , "Divorce" , "Take apart" .)