Complex sentence: The lethal war with kalinga banish the vengeful ashoka to a stable and peaceful emperor and embraced him to buddhism led to expand the buddhsim over mauryan empire and other kingdom during iron age within his domain and worldwide from about 250 BCE.
Split into simpler sentences: The lethal war with kalinga transformed the vengeful Emperor Ashoka to a stable and peaceful emperor and he embraced Buddhism. This led to the expansion of Buddhsim over the Mauryan empire and other kingdoms during his domain and worldwide from about 250 BCE.