The protagonist met the two women in the ruins and from that moment onwards, they spent their time together.
But one day, the women suddenly escaped after taking away the protagonist's gun.
ご質問ありがとうございます。
"The protagonist met the two women in the ruins"＝「主人公と二人の女は廃墟で出会った」
"and from that moment onwards,"＝「そしてそれ以降、」
"they spent their time together."＝「時間を共にした。」
"But one day,"＝「でもある日」
"the women suddenly escaped after taking away the protagonist's gun."＝「女たちは主人公の銃を奪って、突然逃げた。」
ご参考までに。
アメリカ合衆国 
