Parallelism is used when the author describes professionals who have the basic resources for their work, but not for their own use, or for the use of their workers.
Explanation:
Parallelism occurs when an author uses a succession of phrases with similar clauses, or similar structures. This can be seen in the first three sentences of the third paragraph presented in the attached figure, where the author presents different professionals, who, although they have a certain essential resource in their work area, do not have this resource for themselves or for their employees. The use of parallelism in this text, reinforces the idea of how the author is surprised to see how this unavailability of resources is common in several different professions.
The best description would be that they were regularly attacked by the arabs eventually leading to the fall of the Byzantines and there empire and lead to the citys rename to istanbul which is still there in modern day middle east. It is The empire was regularly attacked by Arab Muslims. I hope this helped.