Simplify the following text for a Grade 8 native English-speaking person.
Original: The date was chosen because the ship Restauration coming from Stavanger , Norway , arrived in New York Harbor on October 9 , 1825 at the start of the first organized immigration from Norway to the United States .
Simplified: The date was chosen because the ship Restauration coming from Stavanger , Norway , arrived in New York Harbor on October 9 , 1825 . This was the start of the first organized immigration from Norway to the United States .