Complex sentence: The company's sibling stores include Annie Sez, Sirens, and Urban Behavior, and carry clothes from Ambiance Apparel, UK2LA, Seductions, and Sirens.
Split into simpler sentences: The company's sibling stores include Annie Sez, Sirens, and Urban Behavior. Urban Planet carries clothing vendors such as Ambiance Apparel, UK2LA, Seductions, and Sirens.