Complex sentence: Alexis Ren first started modeling at the age of 13 for Brandy Melville when she was asked to model for them while shopping, after a while of freelance modeling she signed with a modelling agency Nous Model Management at 14, shortly after she book seventeen magazine.
Split into simpler sentences: Alexis Ren first started modeling at the age of 13 for Brandy Melville; when she was asked to model for the company while shopping one day. After a while of freelance modeling she signed with a modelling agency Nous Model Management at 14, shortly after she book seventeen magazine.