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: on september 22 , the system had become more organized , and the national hurricane center mentioned the potential existed for tropical or subtropical development in the area.

SOLUTION: the system had become more organized by september 22 and the national hurricane center mentioned the potential for tropical or subtropical development in the area.

PROBLEM: civil unrest in northern italy spawns the medieval musical form of geisslerlieder , penitential songs sung by wandering bands of flagellants.

SOLUTION: civil unrest in northern italy spawns the medieval musical form of songs sung by wandering bands of flagellants.

PROBLEM: his real date of birth was never recorded , but it is believed to be a date between 1935 and 1939.

SOLUTION:
his real birthday is unknown , but is thought to be between 1935 and 1939.