During those 30 years, he had amassed a fortune… all at the expense of the poor people of Sarawak, especially the natives, many of whom he (and his family) stole their land (from).
Durante esos 30 años ha hecho una fortuna… todo ello a expensas del pobre pueblo de Sarawak, especialmente los nativos, puesto que a muchos de ellos él (y su familia) les ha robado la tierra.