Complex sentence: Prek Cali invited Chetnik officer Marko Vučeljić to have a meeting in Vermosh, which was accepted, Vučeljić sent his brother Tomo to meet with him above Vermosh.
Split into simpler sentences: Prek Cali invited Chetnik officer Marko Vučeljić to have a meeting in Vermosh. Marko accepted Cali's invitation and sent his brother Tomo to meet with him above Vermosh.