Complex sentence: Interfering with the action of p53 allows a cell infected with the virus to move into a different stage of the cell cycle allowing the virus genome to be replicated forcing the cell into the S phase of the cell cycle could cause the cell to become transformed.
Split into simpler sentences: Interfering with the action of p53 allows a cell infected with the virus to move into a different stage of the cell cycle, enabling the virus genome to be replicated. Forcing the cell into the S phase of the cell cycle could cause the cell to become transformed.