wrap (one's) mind around (something)

Translations
понять (что-то) сложное
It took her a while to wrap her mind around the complex theory.
Ей понадобилось время, чтобы понять сложную теорию.
Definitions
To come to understand or accept something that is complex, confusing, or difficult to comprehend.
Words
mind

noun
ум
wrap

verb
заворачивать
around

adverb
вокруг