Complex sentence: The case centered around whether EMI had notified the band about the contract extension in time; as part of the agreement, EMI had to send a written notice within three months after the completion of "Spirit of Eden".
Split into simpler sentences: The case centered around whether EMI had notified the band about the contract extension in time. As part of the agreement, EMI had to send a written notice within three months after the completion of "Spirit of Eden".