Task: Sentence Expansion
Input (English): A pen name , also known as a pseudonym , is a name an author uses in the place of their real name , when they write and publish things .
Output (English): A pen name ( " nom de plume " or " literary double " ) is a pseudonym ( or , in some cases , a variant form of a real name ) adopted by an author and printed on the title page or by-line of their works in place of their real name .