Complex sentence: Crofts eventually returned to California to join The Dawnbreakers and thusly both Seals and Crofts were introduced to and became members of the Bahá'í Faith, however, the band turned out to be unsuccessful.
Split into simpler sentences: Crofts eventually returned to California to join The Dawnbreakers and thusly both Seals and Crofts were introduced to and became members of the Bahá'í Faith. However, the band turned out to be unsuccessful.