Complex sentence: It was also part of an encore medley on the Roll The Bones tour in 1992, and most recently, again in a medly, as the opener for Rush's 2004 R30 tour, when it was part of the "R30 Overture".
Split into simpler sentences: It was also part of an encore medley on the Roll The Bones tour. The last time it was played, it was an opener for Rush's 2004 R30 tour, when it was part of the "R30 Overture".