Review the item:
Struggling to capture the nude model on paper,
Sima whined that she did not have the right pencil at the same time
she realized that this complaint was the same as saying that she could not
sink a basketball because she did not have expensive athletic shoes.
Struggling to capture the nude model on paper is a present participle phrase. A present participle phrase will begin with an ing word like struggling. Sima whined is a main clause. You must use a comma to connect these two parts.