Complex sentence: Shepseskaf broke with the Fourth Dynasty tradition of constructing large pyramid tombs by chosing to construct his tomb as a great mastaba at Saqqara, now known as Mastabat Fara'un.
Split into simpler sentences: Shepseskaf broke with the Fourth Dynasty tradition of constructing large pyramid tombs. He instead built his tomb as a great mastaba at Saqqara, now known as Mastabat Fara'un.