Complex sentence: FEMA has published a book, "Construction of a Simplified Wood Gas Generator for Fueling Internal Combustion Engines in a Petroleum Emergency", in March 1989, describing a different design called the "stratified downdraft gasifier".
Split into simpler sentences: FEMA has published a book, "Construction of a Simplified Wood Gas Generator for Fueling Internal Combustion Engines in a Petroleum Emergency", in March 1989. The FEMA book describes a different design called the "stratified downdraft gasifier".