Complex sentence: Olga de Hartmann was Gurdjieff's personal secretary for many years, and collected many of Gurdjieff's early talks in the book "Views from the Real World" (1973).
Split into simpler sentences: Olga de Hartmann was Gurdjieff's personal secretary for many years. Olga collected many of Gurdjieff's early talks in the book "Views from the Real World" (1973).