Complex sentence: Lasser used his expertise in science, engineering, and rocketry to write the book "The Conquest of Space" (1931) which was the first non-fiction English-language book to deal with spaceflight and detailed how man would one day travel into outer space.
Split into simpler sentences: Lasser used his expertise in science, engineering, and rocketry to write a book called "The Conquest of Space" (1931). It was the first non-fiction English-language book to deal with spaceflight and detailed how man would one day travel into outer space.