Complex sentence: Dom then thinks it was Betty Eagleton (Paula Tilbrook) and kisses her in the cafe as a means of saying thank you but Harriet is convinced it wasn't her as it isn't in her nature.
Split into simpler sentences: Dom then thinks it was Betty Eagleton (Paula Tilbrook) and kisses her in the cafe as a means of saying thank you. But Harriet is convinced it wasn't her as it isn't in her nature.