Complex sentence: The Bulgarians, with the Romanians having declared war over Silistra and their army closing Sofia, had asked for a Russian arbitration and the resulted general armistice signed on 18/31 July, 1913.
Split into simpler sentences: The Bulgarians, with the Romanians having declared war over Silistra and their army closing Sofia, had asked for a Russian arbitration. The resulted general armistice signed on 18/31 July, 1913.