Complex sentence: In terms of world football, clubs Lyon and Marseille are among the richest football clubs in the world and regularly feature in the Deloitte Football Money League ranking of football clubs by revenue generated from football operations.
Split into simpler sentences: In terms of world football, clubs Lyon and Marseille are some of the richest football clubs in the world. The clubs regularly feature in the Deloitte Football Money League, which is the ranking of football clubs by revenue generated from football operations.