Complex sentence: Abhūtaparikalpa or "Ālayavijñāna" meaning imagining the object to exist as independent of consciousness is the basic concept in the Yogacara/Vijnanavada school which is identified as the dependent nature-- "pratantrasvabhava", the second of the three natures postulated by this school.
Split into simpler sentences: Abhūtaparikalpa or "Ālayavijñāna" means-imagining the object to exist as independent of consciousness. It is the basic concept in the Yogacara/Vijnanavada school which concept is identified as "pratantrasvabhava" (dependent nature), the second of the three natures postulated by this school.