〜を余儀なくされる・〜を余儀なくさせる
be forced to; force (someone) to
Noun (中止, 変更, 避難) + を余儀なくされる / を余儀なくさせる
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を余儀なくされる means circumstances forced someone to do something they didn't want to: 大雨のため、試合は中止を余儀なくされた, "the match had to be called off because of heavy rain".
余儀 means "other means", so 余儀ない is "no other choice". The noun is usually a する-verb noun for an unwelcome change: 中止 ("cancellation"), 変更, 避難 ("evacuation"), 引退, 転職, 入院.
The passive される has the affected person as its subject. The causative させる has the cause as its subject: 台風が住民に避難を余儀なくさせた, "the typhoon forced residents to evacuate".
It's formal and very common in news. Compare ざるを得ない (N2), which is more personal: "I have no choice but to".
Examples
大雨のため、試合は中止を余儀なくされた。
The match had to be called off because of heavy rain.
会社の倒産で、彼は転職を余儀なくされた。
When his company went bankrupt, he was forced to change jobs.
台風が、多くの住民に避難を余儀なくさせた。
The typhoon forced many residents to evacuate.
けがのため、彼は引退を余儀なくされた。
Injury forced him to retire.
不況が、多くの企業に人員削減を余儀なくさせた。
The recession forced many companies to cut staff.