Unique rules when forming that grammar are highlighted like this.
Example sentences follow these rules too!
Joining and Nesting Markers:
Verb[た/る] - means that dictionary form and ta form are accepted.
Verb[causative[て]] - means て form of the causative form of the verb.
[至る lit. means to “reach a far stage,” “arrive as far as.” Therefore Aに至ってB is used to express that after certain phase A is reached, B.
[Often expresses speaker/writers dissatisfaction/criticism that B happened at such a late/far point. Usually, verbs like 了解、理解、知る、わかる、明らかになる、気が付く and adverbs like ようやく、いよいよ、ついに、初めて、いまさら follow this grammar point]