он подрабатывал учителем в богатых

он подрабатывал учителем в богатых семьях, и занимался самообразованием в свободное время

Результаты (английский) 1:

He worked as a teacher in wealthy families, and engaged in self-education in his spare time

Результаты (английский) 2:

He moonlighted as a teacher in rich families, and engaged in self-education in your free time

Результаты (английский) 3:

he was a teacher in a rich family, and was a self educated man in your spare time