Student or Learner
It was confused.. why does it use comma(,) between the following that?
I don't know how I read especially last line.
Could you let me know why?
But on the flipside from an evolutionary point of view the reason we are so successful and we're still here is because we can, and when we need to, react aggressively to situations.
Welcome to the forum, Ops in.
It's a complicated sentence, and the incorrect 'and' before 'when' doesn't help. Delete it.
Think of the commas as parentheses or brackets, enclosing a phrase which adds extra information but could be omitted. The phrase 'from an evolutionary point of view' should also have commas before and after it for the same reaason and to aid understanding.