Complex sentence: There is a old story that people would always get fatigued while climbing it and battles were lost because an army was too tired to go on and these events convinced the simple villagers that there was a curse on the mountain.
Split into simpler sentences: There is a old story that people would always get fatigued while climbing it. Also, battles were lost because an army was too tired to go on and these events convinced the villagers that there was a curse on the mountain.