Complex sentence: In Transylvania, they first settled along the rivers Kézd (Saschiz), Orbó (Gârbova), and Sebes (Sebeș), but started to migrate to the easternmost region of the province when the ancestors of the Transylvanian Saxons began to arrive around 1150.
Split into simpler sentences: In Transylvania, they first settled along the rivers Kézd (Saschiz), Orbó (Gârbova), and Sebes (Sebeș). They started to move to the easternmost region of the province when the ancestors of the Transylvanian Saxons arrived around 1150.