Complex sentence: While commercial ice fishing on Great Slave Lake, Canada, he nearly lost his life and wrote his first book, "Beyond the Great Slave Lake" (published by Cassells and E.P. Dutton).
Split into simpler sentences: While commercial ice fishing on the Great Slave Lake, Canada, he nearly lost his life. He described his adventures in Canada in his first book, "Beyond the Great Slave Lake" (published by Cassells and E.P. Dutton).