Complex sentence: Their father appears to favor Brittany considerably over his rude and often misbehaving son; this possible favoritism seems to take place mostly in attitude towards his daughter, whom he dotes on, while his son seems only to aggitate him.
Split into simpler sentences: Their father appears to favor Brittany considerably over his rude and often misbehaving son. This possible favoritism seems to take place mostly in attitude towards his daughter, whom he dotes on, while his son seems only to aggitate him.