Complex sentence: The czar promised Njegoš that Russia would intervene on Montenegro's behalf as if it were one of its own "gubernias", while the Holy Synod vowed to provide all the necessary equipment and funds needed to maintain regular religious services in the country.
Split into simpler sentences: The czar promised Njegoš that Russia would intervene on Montenegro's behalf as if it were one of its own "gubernias". The Holy Synod also promised to provide all the necessary equipment and funds needed to maintain regular religious services in the country.