Simplify the following text for a Grade 8 native English-speaking person.
Original: It was named for Saint Nicholas by Spanish explorer SebastiÃ n VizcaÃ no after he sighted the island on the saint 's feast day ( December 6 ) in 1602 .
Simplified: It was named for Saint Nicholas by Spanish sailor SebastiÃ n VizcaÃ no after he saw the island on the saint 's feast day ( December 6 ) in 1602 .