Complex sentence: Even though he is often seen with an amiable disposition, he could be quite ruthless to those who put his loved ones in danger; he has no qualms in implementing any means necessary in order to protect the people he cares for.
Split into simpler sentences: Even though he is often seen with an amiable disposition, he could be quite ruthless to those who put his loved ones in danger. He has no qualms in implementing any means necessary in order to protect the people he cares for.