I think the reason why he used commas well (And that many other portuguese speakers use commas better than native english speakers) is that in portuguese you NEED to.
If you don't use commas properly in portuguese, you text can easily get excessively ambiguous, because of that schools here stress the comma a lot, I for example had in my fourth grade entire weeks dedicated to commas, and forgetting commas, even in non-langauge tests (example, in math tests) frequently resulted in some punishment (in math tests forgetting commas resulted into a loss of 0.1 points in the grade for each comma, out of the maximum of 10, thus if your math was correct enough to score 5, but you forgot 5 commas, you would instead score 4.5)
I think the reason why he used commas well (And that many other portuguese speakers use commas better than native english speakers) is that in portuguese you NEED to.
If you don't use commas properly in portuguese, you text can easily get excessively ambiguous, because of that schools here stress the comma a lot, I for example had in my fourth grade entire weeks dedicated to commas, and forgetting commas, even in non-langauge tests (example, in math tests) frequently resulted in some punishment (in math tests forgetting commas resulted into a loss of 0.1 points in the grade for each comma, out of the maximum of 10, thus if your math was correct enough to score 5, but you forgot 5 commas, you would instead score 4.5)