Complex sentence: Yookyung is the daughter of Hong Ha-jong, a CEO of a big manufacturing company, and granddaughter of the founder of On April 23,2013, it was announced that Yookyung left the group to focus on her studies.
Split into simpler sentences: Yookyung is the daughter of Hong Ha-jong, a CEO of a manufacturing company,, founded by her grandfather. In April 2013, Yookyung left the group to focus on her studies.