Complex sentence: Richard accompanied his mother on tour to various theatres but she found it increasingly difficult to cope, and in 1897 he was sent to school in Linz, when his father took over his upbringing.
Split into simpler sentences: Richard accompanied his mother on tour to theatres, but she found it increasingly difficult to cope. In 1897 he was sent to school in Linz, when his father took over his upbringing.