Complex sentence: Most voting blocs continued unchanged, but others realigned themselves, giving a strong Republican dominance in the industrial Northeast, though the way was clear for the Progressive Era to impose a new way of thinking and a new agenda for politics.
Split into simpler sentences: Most voting blocs continued unchanged, but others realigned themselves, giving a strong Republican dominance in the industrial Northeast. Though the way was clear for the Progressive Era to impose a new way of thinking and a new agenda for politics.