Complex sentence: On the morning of 16 September, the Serbians overrun the Koziaka mountain range and the Golo Bilo peak; they were soon joined by the 35th Greek Regiment, crossing the Poroi river and later marching on Topolets.
Split into simpler sentences: On the morning of 16 September, the Serbians overran the Koziaka mountain range and the Golo Bilo peak. They were joined by the 35th Greek Regiment which crossed the Poroi river and later marching on Topolets.