A library uses various methods to arrange books on the shelves. Most fiction books are arranged alphabetically, by the author's last names. On the other hand, most non-fiction books are arranged following the Dewey Decimal Classification System (DDC), developed by Melvin Dewey.
The last sentence is an example of a comma splice since 2 independent clauses are connected by only a comma(it needs a coordinating conjunction after the comma or change it to semicolon or period)
