Complex sentence: Certain foods and lifestyle are considered to promote gastroesophageal reflux, however a 2006 review found that most dietary interventions are anecdotal; only weight loss and elevating the head of the bed were supported by evidence.
Split into simpler sentences: Certain foods and lifestyle are considered to promote gastroesophageal reflux, however most dietary interventions are anecdotal. Weight loss and elevating the head of the bed are supported by evidence.