Quirk's Grammar says in American English there's sentences like this:
Since I last saw you, my mother died.
Does the 'Since' mean 'After' here? Thank you in advance.
After, but not necessarily immediately after. I may have last seen you in 2008, and she may have died only last month.
However, by using simple past instead of present perfect, it does imply the death was not recent.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.