I'm having very serous problem nowadays. My galaxy s3 phone is broken. I can't see screen, and also sensor isn't working. But I have heard about controlling phone through pc. Please help me. I look forward hearing from tou soon?

There is a feature called Screen Mirroring where your phone's screen is mirrored onto your computer. Unfortunately, this feature is partially enabled through your phone. I would highly recommend a new phone anyway as the S3 is no longer supported.