Example : I cannot connect these two pieces of evidence in my mind.
Colligate these facts.
I cannot relate these events at all.

Synonyms : associate, colligate, connect, link, link up, tie in

Example : There were lots of questions referring to her talk.
My remark pertained to your earlier comments.

Synonyms : bear on, come to, concern, have to do with, pertain, refer, touch, touch on

Example : The witness related the events.

Example : How are these two observations related?.

Synonyms : interrelate

Example : She relates well to her peers.