Complex sentence: Mariam Petrosyan (born 10 August 1969) is an Armenian painter, cartoonist and Russian-language novelist, most known as the author of the award-winning novel "The Gray House" (2009) translated into eight languages.
Split into simpler sentences: Mariam Petrosyan (born 10 August 1969) is an Armenian painter, cartoonist and Russian-language novelist. She is most well known as the author of the award-winning novel "The Gray House" (2009), translated into eight languages.