Complex sentence: At its height Thomas sang 60 live concerts a year in the United States and further afield in Wales, Germany, and Australia as well as performing on weekly radio broadcasts, and for a time he was the highest paid concert in the United States.
Split into simpler sentences: At its height Thomas sang 60 live concerts a year in the United States and further afield in Wales, Germany, and Australia as well as performing on weekly radio broadcasts. For a time he was the highest paid concert artist in the United States.