Complex sentence: Axelrod originally wanted some of the album's compositions to feature a large-scale choir, but was uncertain if he could find the appropriate ensemble, so he recorded an entirely instrumental album and included one Blake setting for each section of the score.
Split into simpler sentences: Axelrod originally wanted some of the album's compositions to feature a large-scale choir, but was uncertain if he could find the appropriate ensemble. As a result, he recorded an entirely instrumental album and included one Blake setting for each section of the score.