Complex sentence: Lambert was in group 2 and performed "(I Can't Get No) Satisfaction", after which, he was voted into the top 13, joining fellow group 2 performers Allison Iraheta and Kris Allen.
Split into simpler sentences: Lambert was in Group 2 and performed "(I Can't Get No) Satisfaction". Nonetheless, Lambert was voted into the top 13, joining fellow Group 2 performers Allison Iraheta and Kris Allen.