TASK DEFINITION: In this task, you're given a sentence and your task is to generate a simplified sentence that focuses on lexical paraphrasing from the original sentence given in the input.
PROBLEM: this is also the origin of the terms ante meridiem and post meridiem as noted below.

SOLUTION: this is the origin of the terms ante meridiem and post meridiem.

PROBLEM: influences regional at the end of the 12th century europe was divided into a multitude of city states and kingdoms.

SOLUTION: europe was divided into a large number of city , states , and kingdoms at the end of the 12th century due to regional influences.

PROBLEM: harry potter is a series of seven fantasy novels written by british author j. k. rowling.

SOLUTION:
harry potter is a group of seven fantasy books written by british author j. k. rowling.