Something you might notice when you first read this snippet from an Australian convict in the 1800s is that it’s long. It’s a single, elaborate, multi-part sentence. That’s partly the style of the time and partly the fact it’s a letter: this is a train of thought, and that train is a long one.
The letter observes the rules that ‘a man has to mind’, the reward if ‘he does his master’s duty’, and the brutal punishments ‘if he don’t’.