Complex sentence: He also guested in "2 Days & 1 Night" after being invited on-air by labelmate Cha Tae-hyun where his appearance recorded a 19.9% audience share--the show's highest rating in two years.
Split into simpler sentences: He also guested in "2 Days & 1 Night" after being invited on-air by labelmate Cha Tae-hyun. His appearance recorded a 19.9% audience share--the show's highest rating in two years.