The cell organelle involved in forming Complex Sugars from simple sugars are:

(1) The Golgi apparatus consists of a system of membrane-bound vesicles arranged in stacks called cisternae.
(2) The synthesized material is packaged near the ER and sent to various targets through the Golgi apparatus.
(3) Its functions include storage, modification and packaging of products in vesicles.
(4) Sugar complex can be made from simple sugar in Golgi apparatus. It is also involved in the formation of lysosomes.