It's really not hard to understand... The second and third lines have a single tab to do a lexical indent. Then the third line uses spaces to align the "that"

It's really not hard to understand... The second and third lines have a single tab to do a lexical indent. Then the third line uses spaces to align the "that" with "this". Not that I see any reason to format code this way; IME it makes code much less predictable when reading and thus more cognitive load to read and understand.