Complex sentence: It features tracks originally written, performed live and demoed in 1973-5 during Williamson's tenure with The Stooges in the period following the release of 1973's era-defining Raw Power and before the group disbanded.
Split into simpler sentences: It features tracks originally performed live and demoed in between 1973 and 1975 during Williamson's tenure with The Stooges. They were mainly composed in the period following the release of 1973's era-defining Raw Power and before the group disbanded.