Complex sentence: The opening theme song is by Karin Isobe, while the first ending theme from the first 25 episode is, the second ending theme from episode 26 is by Rie Kitagawa.
Split into simpler sentences: The opening theme song is by Karin Isobe. The first ending theme from the first 25 episode is, while the second ending theme from episode 26 onwards is, both performed by Rie Kitagawa.