Simplify the following text for a Grade 8 native English-speaking person.
Original: When Subtropical Storm Vince formed on October 8 , it was the earliest in the season that the twenty-first tropical or subtropical storm had ever developed , 38 days ahead of the previous record held by Tropical Storm 21 of the 1933 season .
Simplified: When Subtropical Storm Vince began on October 8 , it was earliest in a season that the twenty-first tropical or subtropical storm formed . It was 38 days ahead of the record before that , which was set by Tropical Storm 21 of the 1933 season .