Binge drinking, drug abuse, rape and murder. The four social issues that are relatively heavy in matter yet seem to be light within society. The play blackrock written by Nick enright reveals truths that reality obscures. Enright chooses to expose these issues that have been kept in the dark.
You need to watch your capitalization and make sure you either underline or italicize the title of the play.
I don't quite understand "truths that reality obscures."
these are heavy matters that seem to be treated lightly by society
(Do you really think that rape and murder are treated lightly?)
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.