Complex sentence: In 2008, he was chosen as a member of the group Shinee, the 5-member boy group debuted on May 25,2008 on SBS's Inkigayo.
Split into simpler sentences: In 2008, he was chosen as a member of the group Shinee, the 5-member boy group. The group debuted on May 25,2008 on SBS's Inkigayo.