"Last week I held my own wedding ceremony at a church in Higashi-ku, Fukuoka. The church was designed by Mr. Tanaka,a world-famous architect." となります。
これが1つの良い書き方です。
多くの学校や塾では文法内容の定着と言う目的もあり、 "Last week I held my wedding ceremony at a church which was located in Higashi-ku, Fukuoka and designed by Mr. Tanaka who was a world-famous architect."