Complex sentence: The slick, highly produced Fania sound was too formulaic for some, which opened up a niche for more adventurous bands, such as Eddie Palmieri and Manny Oquendo's Libre.
Split into simpler sentences: The slick, highly produced Fania sound was too predictably formulaic for some tastes. There was a niche for more adventurous bands, such as Eddie Palmieri and Manny Oquendo's Libre.