In https://en.wikipedia.org/wiki/SO(8)#Spin(8), it says that
"Sometimes Spin(8) appears naturally in an "enlarged" form, as the automorphism group of Spin(8), which breaks up as a semidirect product: Aut(Spin(8)) ≅ Spin (8) ⋊ S3."
Can someone explain what is the detailed main idea of this sentence?