A physical fight broke out inside Armenia's parliament after a ruling-party lawmaker mocked an opposition leader's family. What began as personal insults quickly turned into a brawl among politicians.
broke out= 「(争い・火事などが)突然発生した」という意味の句動詞です。turned into= 「〜へと変化した、発展した」という意味で、状況が別の状態へ移行することを表します。
The violence caused visible injuries inside the chamber. According to reports, one opposition member of parliament (MP) suffered a bloody nose during the clash, while another lawmaker had torn clothes.
According to= 「〜の報道や情報によれば」と情報源を引用・言及する前置詞句です。
The incident marked the third time that a brawl has happened inside Armenia's parliament in a single month.
marked the third time that= 「〜が起きた3回目の出来事となった」という意味で、記録や節目を報告する際によく使われる表現です。