To Tell Apart, To Recognize
transitive verb, ichidan verb
You see something, then you "separate"(分ける) it. This is the same thing as to distinguish, to tell apart, or to recognize. This verb is transitive, so you're doing the action to something. You're distinguishing between things or people.
You should know the reading of 見 already. The second part, 分ける is a word you should have learned in the previous level. Combine that knowledge together and you get the reading for this word.
I tell the brothers apart by their eye colors.
It's impossible to tell whether what the man said is true.
Are you able to distinguish between diamonds and stones?