Complex sentence: T.K. was also a trainee under Cube Entertainment; he was in the original lineup for the group BTOB and filmed alongside them in the sitcom "I Live in Cheongdam-Dong", but was pulled out of the group due to a medical condition.
Split into simpler sentences: T.K. was also a trainee under Cube Entertainment; he was in the original lineup for the group BTOB and filmed alongside them in the sitcom "I Live in Cheongdam-Dong". Unfortunately he was pulled out of the group due to a medical condition.