Langston Hughes may be best known for his poetry , but included among his many published works are a sizable collection of short stories. 后半句是倒装句,如果不倒装就是
Langston Hughes may be best known for his poetry , but a sizable collection of short stories are included among his many published works.
后边这个句子的主语是a sizable collection of short stories,主语是collection,所以are不对,应该改成is