Complex sentence: The song was first recorded as a demo during the recording sessions for the 1977 Fleetwood Mac album, "Rumours", and this demo was included on the "Rumours" expanded re-release in 2004.
Split into simpler sentences: The song was first recorded as a demo during the recording sessions for the 1977 Fleetwood Mac album, "Rumours". The 1977 demo version was included on the "Rumours" expanded re-release in 2004.