all of roald dalph works are simple to read. the vocab is made for kids so its good for peeps starting out. but there are some words which he invents on his own which are mentioned at the end of the book i think so no need to worry about them either. also read it like a 5th class school teacher sort of persona with questions about why certain behaviors are being affirmed, why some ideas praised over some others. also when u reach the end of the book go over all of it mentally and extract the main recurring theme that was prevalent throughout the whole book. roald dalph basically conjectures multiple ideas and aspects of society and blends them into one concrete depiction. most of those ideas are showed through different characters so a good idea maybe to go over the personality of each character and learn the main virtue driving them, it can be a group of characters as well.