Complex sentence: Undoubtedly, it would be difficult to expand some of the single-game (or single-season) MLB players to Start class, but the articles below should be the "low-hanging fruit" of baseball stubs.
Split into simpler sentences: Undoubtedly, it would be difficult to expand the entries of the single-game MLB players to Start class. The articles below should be the "low-hanging fruit" of baseball stubs.