Complex sentence: In preparation for the premiere, Cappella Romana's music director Alexander Lingas traveled to St. Petersburg in 2013 to examine Steinberg's manuscripts, resulting in a new edition of the lost work, published by Musica Russica.
Split into simpler sentences: In preparation for the premiere, Cappella Romana's music director, Alexander Lingas, had traveled to St. Petersburg in order to examine Steinberg's manuscripts. His research resulted in a new edition of the lost work, published by Musica Russica.