Complex sentence: An entire room full of people fell in love with him because of the experiment at the Valentine's Dance, however Lilo's friend (and crush) Keoni was the only one to have a real crush on him (which did not last long).
Split into simpler sentences: An entire room full of people also fell in love with him because of the experiment at the Valentine's Dance. However, Lilo's friend (and crush) Keoni was the only one to have a real crush on him (which did not last long).