Complex sentence: Jerry Garcia did not attend the ceremony due to having an opposition to the Rock Hall, the band did not perform but as a joke the other band members brought a cardboard cut-out of him during the induction speech.
Split into simpler sentences: Jerry Garcia did not attend the ceremony due to having an opposition to the Rock Hall so the band did not perform. As a joke the other band members brought a cardboard cut-out of him during the induction speech.