Complex sentence: Philippine nationality law is currently based upon the principles of "jus sanguinis" and therefore descent from a parent who is a citizen/national of the Republic of the Philippines is the primary method of acquiring Philippine citizenship.
Split into simpler sentences: Philippine nationality law is currently based upon the principles of Jus sanguinis. In other words, descent from a parent who is a citizen/national of the Republic of the Philippines is the primary method of acquiring Philippine citizenship.