Complex sentence: His brother Otto (1842-1913) was also a pianist, organist and composer; he prepared the "Sonata on the 94th Psalm" for its first publication in August 1871.
Split into simpler sentences: His brother Otto (1842-1913) was also a pianist, organist and composer. He prepared the "Sonata on the 94th Psalm" for its first publication in August 1871.