Complex sentence: Ralph Abercromby is noted his report in "Seas and skies in many latitudes" on weather and telegraphy at the US signals office, and for his study of cloud formation, figuring prominently in the history of the classification system developed by Luke Howard.
Split into simpler sentences: Ralph Abercromby is noted for his contributions to meteorology, his travels producing reports in "Seas and skies in many latitudes" such as weather and telegraphy at the US signals office. He wrote on the nomenclature of cloud formation, and figured prominently in the history of the classification system developed by Luke Howard.