Complex sentence: The book contains 18 colour plates of moths found in the vicinity of Sydney, with accompanying descriptive text, and Lewin was considerably assisted in the identification and classification of the species depicted by entomologist Alexander Macleay.
Split into simpler sentences: The book contains 18 colour plates of moths found in the vicinity of Sydney, with accompanying descriptive text. He was considerably assisted in the identification and classification of the species depicted by entomologist Alexander Macleay.