Simplify the following text for a Grade 4 native English-speaking person.
Original: ( He was a last-minute substitute for an indisposed singer . ) He gave his first Lieder recital in Leipzig in the autumn of 1947 and followed it soon afterwards with a highly successful first concert at Berlin 's Titania-Palast .
Simplified: ( He was a last-minute substitute for a singer who was ill. ) He gave his first Lieder recital in Leipzig later that year .