恢复被破坏的合并并使用Git重新应用所选的提交

We recently encountered a problem where a merge somehow led to all the changes leading to one parent being undone in the merge commit, and several commits have been applied after that point. All this has been pushed to our shared origin repository. I want to be able to revert the bad merge and reapply the other change sets. What is the easiest way to do this?We recently encountered a problem where a merge