Is “even when” a conjunction?
These are all different.
Following the rules is essential, even when it's difficult.
Sometimes it is easy, other times difficult but ...
Following the rules is essential, even if it's difficult.
It might not be easy but ...
Following the rules is essential, even though it's difficult.
We know its not easy but ...
The phrase even when is a subordinating conjunction.
Compare these two sentences:
I keep correcting papers even when I am tired.
Even when I am tired, I keep correcting papers.