In prehistoric times, the forest of the Ailao Mountain had been the 'home' and the natural shelter of the forefathers of the Hani.
(the forest of the Ailao Mountain; had been; the 'home' and the natural shelter of the forefathers of the Hani; T:In prehistoric times)
the forest of the Ailao Mountain
had been
the 'home' and the natural shelter of the forefathers of the Hani T:In prehistoric times