Complex sentence: The Eritrean Ascari originated from a mercenary Arab group of the Ottoman Empire called "Basci Buzuk", that was created in Eritrea by the Albanian adventurer Sagiak Hassan, who worked for local Eritrean tribes in the second half of the XIX century.
Split into simpler sentences: The Eritrean Ascari originated from a mercenary Arab group employed by the Ottoman Empire and called "Basci Buzuks". This irregular force was created in Eritrea by the Albanian adventurer Sagiak Hassan, who worked for local Eritrean tribes in the second half of the XIX century.