翻译:经过一个月的艰苦的谈判,双方作出了最终决定(decision)

Going through one month of hard negotiation, both sides made the final decisions

After a hard one-monthed negotiation, the both parties have come to a final decision.

After a month of hard negotiation, both sides made the final decision

After a month of hard negotiation, both parties made a final decision.