〜に至って(ようやく)
only when it came to, only after it reached
Verb dictionary form / Noun + に至って(ようやく・初めて)
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に至って means "only when things reached this (extreme) point": 死者が出るに至って、ようやく国は対策を始めた, "only when people started dying did the government finally take action".
It's usually followed by ようやく, やっと or 初めて, and the tone is critical: someone should have acted much earlier. The first half describes a serious stage: deaths, bankruptcy, a lawsuit, a worsening illness.
It's a formal, emphatic relative of てはじめて (N3). 至る means "to reach", so it's literally "having reached as far as…".
There are two related patterns: に至るまで, "right down to", and に至っては, "as for (the most extreme case)".
Examples
死者が出るに至って、ようやく国は対策を始めた。
Only when people started dying did the government finally take action.
事態がここに至って、会社はやっと非を認めた。
Only when things came to this did the company finally admit fault.
倒産寸前に至って、社長はようやく改革に乗り出した。
Only on the brink of bankruptcy did the president finally start reforms.
病気が悪化するに至って、初めて病院に行った。
Only when his illness got worse did he finally go to hospital.
裁判になるに至って、相手はようやく話し合いに応じた。
Only when it went to court did the other side finally agree to talk.