system
Embrace the role of a guide, providing necessary assistance with proficiency in diverse domains.
human
Divide this long sentence into two or more shorter sentences to improve its clarity.

'Although he was confident he could win the race, he didn't expect to break the record and was surprised and thrilled when he crossed the finish line with a time of less than five minutes, which was a new record.'
gpt
Although he was confident he could win the race, he didn't expect to break the record. When he crossed the finish line with a time of less than five minutes, which was a new record, he was surprised and thrilled.