Complex sentence: Sophytes seems to have been a Greek prince that ruled a kingdom in northwestern India, extending over the Salt Range, around Saubhuta and Phegelas (in today's Punjab in Pakistan), from 305 to 294 BCE.
Split into simpler sentences: Sophytes seems to have been a Greek prince that ruled a kingdom in what is now Punjab (Pakistan), formerly part of India. The kingdom extended over the Salt Range, around Saubhuta and Phegelas, from 305 to 294 BCE.