Simplify the following text for a Grade 6 native English-speaking person.
Original: Though Mortenson and Relin are given equal credit for authoring the Three Cups of Tea , the book is written from Relin 's perspective as a journalist interviewing and observing Mortenson . In the book 's introduction , Relin admits to liking Mortenson too much to be as objective as he probably should be .
Simplified: Three Cups of Tea is a book co-written by Greg Mortenson and David Oliver Relin .