Do you have Marie's marriage cert? You need to know her place of birth to go any further. Evans is a very common name and you may end up following the wrong family if you don't have documentation.
If that is her parents marriage that Kellie has posted, then you will find George's WW1 service record at the NAA. It seems from the electoral rolls that George and Doris may have separated early on. He seems to have been up to something as he keeps changing his name in the letters contained in his service record.http://dhistory.org/archives/naa/items/1909262/