Complex sentence: The found a common anti-war ground with the Independent Social Democrats who had split off from the Social Democratic Party, and in this context their former, differences with Socialist women such as Clara Zetkin became less important.
Split into simpler sentences: The found a common anti-war ground with the Independent Social Democrats who had split off from the Social Democratic Party. In this context, their former differences with Socialist women such as Clara Zetkin became less important.