The ruling party has lost its majority, which means it can no longer pass legislation without the support of opposition parties. This situation has resulted in political instability as the government struggles to achieve a stable majority for lawmaking.
こんにちは！
ご質問ありがとうございます。
ご質問について、いくつか言い方が考えられますが、例えば、
The ruling party has lost its majority, which means it can no longer pass legislation without the support of opposition parties. This situation has resulted in political instability as the government struggles to achieve a stable majority for lawmaking.
とすると、『与党が過半数を割ってしまい、法案が可決するためには与党だけで賛成多数とすることができず野党の賛成も必要となり、政局が[不安定](https://eikaiwa.dmm.com/uknow/questions/65607/)』となります。
参考になれば幸いです。
日本 
