Complex sentence: In recent years there has been an increase in the number of companies who have received fair trade certification for their soccer balls (e.g., Senda Athletics, Etiko's Fair Trade Shop, and Social Conscience: Fair Trade Sports Balls).
Split into simpler sentences: In recent years there has been an increase in the number of companies who have received fair trade certification for their soccer balls. Fair trade certified soccer balls are indeed being produced by a few companies (e.g., Senda Athletics, Etiko's Fair Trade Shop, and Social Conscience: Fair Trade Sports Balls).