Complex sentence: Trained from an early age to be tough phalanx spearmen, these men were from wealthy Carthaginian families, and as such were able to afford high quality armor and weapons.
Split into simpler sentences: Trained from an early age to be tough phalanx spearmen, these men were from wealthy Carthaginian families, and as such had extremely good equipment. They were trained from birth to be great warriors and they were able to afford high quality armor and weapons.