Correction for the given sentence: A city of Venice attracts many travelers as it sparkles in the sunshine.

Explanation:

1. Identifying the error:
The given sentence has some errors that need to be corrected. The errors are as follows:
- The indefinite article "a" is used twice before "Venice".
- The verb "attract" should be in the singular form.
- The word "sparking" should be "sparkles".

2. Corrected sentence:
The corrected sentence would be: "The city of Venice attracts many travelers as it sparkles in the sunshine."

Explanation of the correction:

2.1. The indefinite article "a" used twice:
The error in the original sentence is the use of the indefinite article "a" twice before the word "Venice". This is incorrect because "Venice" is a proper noun and does not require an article before it. Therefore, the correction removes one of the articles.

2.2. Correcting the verb form:
The verb "attract" should agree with the subject "city", which is singular. Therefore, the correction changes the verb form to "attracts".

2.3. Correction of the word "sparking":
The word "sparking" in the original sentence is incorrect. It should be "sparkles" to indicate the action of shining or glittering in the sunshine. The correction replaces "sparking" with "sparkles".

3. Final corrected sentence:
"The city of Venice attracts many travelers as it sparkles in the sunshine."

Summary:
The original sentence had errors in the use of articles and verb form. The corrected sentence removes one of the articles before "Venice", changes the verb form to "attracts", and replaces "sparking" with "sparkles". The corrected sentence now accurately conveys that the city of Venice attracts many travelers due to its sparkling appearance in the sunshine.