Complex sentence: Nearly every episode after season three ends with a scene of Booth and Brennan bonding, which become increasingly romantic over time, reflecting the ever-growing affection Booth and Brennan have for each other.
Split into simpler sentences: Nearly every episode since season three ends with a scene of Booth and Brennan bonding. These scenes have become increasingly romantic over time, reflecting the ever-growing affection Booth and Brennan have for each other.