TASK DEFINITION: In this task, you're given a pair of sentences, sentence 1 and sentence 2, that contradict each other. Your job is to alter sentence 2 so that the pair agree with each other. Generated sentences must be short, with less than 15 words. New information can be introduced. Avoid using pronouns to confuse the subject of the sentence.
PROBLEM: Sentence 1: A dark-haired man in a red t-shirt, with a beard, playing the guitar in a park. Sentence 2: The man is playing guitar in a dark night club.

SOLUTION: The man is in the park.

PROBLEM: Sentence 1: A city worker clean outside window of a train. Sentence 2: The worker is cleaning the interior of the train.

SOLUTION: A city worker is outside working.

PROBLEM: Sentence 1: Two children are riding horses over sand near a white fence. Sentence 2: Children are riding horses in the grass.

SOLUTION:
Children are riding horses on the sand.