Complex sentence: The king of Ratnapur (Surguja) attacked this kingdom in concern with the marriage of the only daughter of the Haihay king and during this aggression the "Haihay King" was killed and his kingdom was destroyed.
Split into simpler sentences: The king of Ratnapur (Surguja) attacked this kingdom over the marriage of the only daughter of the Haihay king. During this aggression the "Haihay King" was killed and his kingdom was destroyed.