Simplify the following text for a Grade 10 native English-speaking person.
Original: His career started in Mexico on Indie label Fonovisa who helped turn him into one of the most popular artists in Latin America and in the Latin market in the United States , selling more Spanish albums than any other artists in that period of time .
Simplified: Iglesias started his musical career on Mexican label Fonovisa . This helped turn him into one of the most popular artists in Latin America and in the Hispanic or Latino market in the United States , and the biggest seller of Spanish language albums of that decade .