Simplify the following text for a Grade 10 native English-speaking person.
Original: Subtropical Storm One became the earliest recorded tropical or subtropical storm to form in the Atlantic basin , and the only one to do so at all during January , when it formed on January 18 .
Simplified: Subtropical Storm One gave the 1978 a very early start to its hurricane season when it became the only Atlantic cyclone to form in the month of January , it formed on January 18 .