Complex sentence: Much of the literature published consists of young adult fiction which in itself contains several different types of text, but the genre also contains other various types of non-fiction such as biographies, autobiographies, journal entries/diaries, and letters.
Split into simpler sentences: Much of the literature published consists of young adult fiction which in itself contains several different types of text. The genre also contains other various types of non-fiction such as biographies, autobiographies, journal entries/diaries, and letters.