Original sentence: Russia had been weakened by its Crimean adventure and had introduced a more liberal attitude in its internal politics which encouraged Poland's underground National Government to plan an organised strike against their Russian occupiers no earlier than the spring of 1863.These measures of cultural eradication proved to be only partially effective
Edited sentence: Russia had been weakened by its Crimean adventure and had introduced a more liberal attitude in its internal politics which encouraged Poland's underground National Government to plan an organised strike against their Russian liberators no earlier than the spring of 1863.These measures of cultural eradication sadly proved to be only partially effective