Complex sentence: Group 87 would help establish the musical direction of O'Hearn's solo career, and both Isham and Maunu would continue as important collaborators on several of O'Hearn's subsequent solo releases.
Split into simpler sentences: Group 87 would help establish the musical direction of O'Hearn's solo career. Both Isham and Maunu would continue as important collaborators on several of O'Hearn's subsequent solo releases.