Complex sentence: Bulgarian prime minister Boyko Borisov, on 13 May 2015 told the country's parliament that he has sent Bulgarian Army troops to the border with Macedonia in order to stop a possible influx of refugees into the country and to prepare to stop potential terrorist attacks.
Split into simpler sentences: Bulgarian prime minister, Boyko Borisov, on 13 May 2015 told the country's parliament that he has sent the Bulgarian Army on the border with Macedonia. In order to stop a possible infiltration of refugees into the country, and prepare to stop potential terrorist attacks.