Original: While Staunton was busy with the Shakespeare edition, he received a courteous letter from the New Orleans Chess Club, inviting him to that city to play Paul Morphy, who had won the recent First American Chess Congress.
Simplified: While Staunton was busy with the Shakespeare edition, he received a courteous letter from the New Orleans Chess Club, inviting him to that city to play Paul Morphy, who had won the first American Chess Congress.