Complex sentence: Ella and Manny always get in a fight, Ella is so fierceful especially when it comes to boys, she is not afraid of anything even Manny, but she doesn't know that Manny has feelings for her.
Split into simpler sentences: Ella and Manny always get in a fight, Ella is so fierceful especially when it comes to boys. She is not afraid of anything not even Manny, but she doesn't know that Manny has feelings for her.