Complex sentence: Earl Paul had not been well loved by his female kin, as his mother and her sister, Frakkok, had previously tried to murder him with a poisoned shirt which instead caused the death of his brother Harald.
Split into simpler sentences: Earl Paul had not been well loved by his female kin. His mother and her sister, Frakkok, had previously tried to murder him with a poisoned shirt which instead caused the death of his brother Harald.