Complex sentence: Lupin is sacked from Perkupps for persuading their top client, Mr Crowbillion, to take his business to another firm, which gives him £25 commission and a job at £200 a year.
Split into simpler sentences: Lupin is sacked from Perkupps for persuading their top client, Mr Crowbillion, to take his business to another firm. The new firm rewards him with £25 commission and a job at £200 a year.