Complex sentence: Jaejoong is the oldest member and Yunho is the second oldest member in the group.yunho and Jaejoong are also the closest since they spent most of their trainee days together.
Split into simpler sentences: Jaejoong is the oldest member and Yunho is the second oldest member in the group. Yunho and Jaejoong are also the closest since they spent most of their trainee days together.