Complex sentence: This was her second children's book following the release of her first children's book "The Princess and the Pony" in 2015, whereupon she received recognition from movie director Guillermo del Toro who invited her to an advanced screening of Crimson Peak.
Split into simpler sentences: This was her second children's book following the release of her first children's book "The Princess and the Pony" in 2015. Where she received recognition from movie director Guillermo del Toro who invited her to an advanced screening of Crimson Peak.