Complex sentence: This is implemented by providing Mammal and WingedAnimal with an information of the memory offset between the beginning of a Mammal and of its Animal part is unknown until runtime, thus Bat becomes (vpointer, Mammal, vpointer, WingedAnimal, Bat, Animal).
Split into simpler sentences: This is implemented by providing Mammal and WingedAnimal with an information of the memory offset between the beginning of a Mammal and of its Animal part is unknown until runtime. Thus Bat becomes (vpointer, Mammal, vpointer, WingedAnimal, Bat, Animal).