The person who wrote this book is famous and has been in charge of a radio program for over thirty years.
この本 this book
書いた方 the person who wrote
有名 famous
30年以上 over thirty years
ラジオ番組 radio program
担当中 has been in charge of
例文 The person who drew this picture is famous, and has been working as an artist for over 20 years.
「この絵をかいた人は有名で、芸術家として20年以上働いています。」
参考になれば幸いです。
"The author of this book is well-known and has been hosting a radio show for over 30 years."
"The author of this book is well-known and has been hosting a radio show for over 30 years."
・author = 著者
・well-known = 有名
・has been hosting = ずっと担当している（現在も継続）
少しシンプルに言うなら
"The person who wrote this book is famous and has hosted a radio program for more than 30 years."
オーストラリア 
アメリカ合衆国 
