Task: Text Simplification
Input (English): 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-.
Output (English): this era coincided with the medieval warm period -lrb- 800 1300 -rrb- and ended with the beginning of the little ice age -lrb- about 1250 1850 -rr.