Complex sentence: Another definition is "a battery of social skills whose goal is to ensure everyone feels affirmed in a social interaction," therefore, being polite can be an attempt to for the speaker to save their own face or the face of a referent.
Split into simpler sentences: Another definition is "a battery of social skills whose goal is to ensure everyone feels affirmed in a social interaction". Therefore, being polite can be an attempt for the speaker to save their own face or the face of a referent.