Complex sentence: The sweet as it is known today was invented by Bekir Effendi as a Christmas dessert, who moved from his hometown Kastamonu to Constantinople (now Istanbul) and opened his confectionery shop in 1776.
Split into simpler sentences: The sweet as it is known today was invented by Bekir Effendi as a Christmas dessert. Effendi moved from his hometown Kastamonu to Constantinople (now Istanbul) and opened his confectionery shop in 1776.