Complex sentence: Mustafa Bey reacted by sending a detachment of 500 infantrymen to hold Karaiskakis' advance, the rest of the Turkish army occupied a hill overlooking the village.
Split into simpler sentences: Mustafa Bey reacted by sending a detachment of 500 infantrymen to hold Karaiskakis' advance. The rest of the Turkish army occupied a hill overlooking the village.