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 era coincided with the medieval warm period -lrb- 800 1300 -rrb- and stopped with the start of the little ice age -lrb- about 1250 1850 -rrb-.

SOLUTION: this era began during the medieval warm period , -lrb- 800-1300 -rrb- and ended with the start of the little ice age -lrb- 1250-1850 -rrb-.

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: given these assumptions it is possible to calculate how often they can fail and to arrange the array to make data loss arbitrarily improbable.

SOLUTION:
given these assumptions , it 's possible to calculate how often they can fail and arrange the array to nake data loss arbitrarily improbable.