Complex sentence: Particularly, a 16th-century Tigray monk named Bahrey is the foremost source on the migrations (written in Ge'ez), his book was called the "History of the Galla" (Ge'ez ዜናሁ ፡ ለጋላ "zēnahu legalla").
Split into simpler sentences: Particularly, a 16th-century Tigray monk named Bahrey is the foremost source on the migrations. Written in Ge'ez, his book was called the "History of the Galla" (Ge'ez ዜናሁ ፡ ለጋላ "zēnahu legalla").