Complex sentence: Ptolemy had also trained in the Macedonian way of warfare, which means as a sarissa bearing phalanx another 3,000 Libyans under Ammonius the Barcian and 20,000 Egyptians under his chief minister Sosibius.
Split into simpler sentences: Ptolemy had also trained in the Macedonian way of warfare, which means as a sarissa bearing phalanx. He had another 3,000 Libyans under Ammonius the Barcian and 20,000 Egyptians under his chief minister Sosibius.