Complex sentence: At first, Keima assumes she has a Loose Soul, because she triggers Elsie's skull badge detector, but after he tries to help her with the robot and gives her a kiss, no spirits are freed.
Split into simpler sentences: At first, Keima assumes she has a Loose Soul, because she triggers Elsie's skull badge detector. When he tries to help her with the robot and gives her a kiss, no spirits are freed.