as the book is written in english, it is hard to read.-구문에서요.
주절 주어와 종속절 주어가 다르지 않나요? 주절의 주어는 to read아닌가요?
그러면
the book being written in english, it is hard to read. 같은데...
written in english, it is hard to read.라고 해서요...