Complex sentence: The soldiers seemed to believe what was said to them, after the battle of Narva many soldiers believed that God had sent them the snow blaze that helped them to victory, after the battle of Poltava many believed that God had changed sides.
Split into simpler sentences: The soldiers seemed to believe what was said to them, after the battle of Narva many soldiers believed that God had sent them the blizzard that helped them to victory. After the battle of Poltava many believed that God had changed sides.