Complex sentence: Side effects include a 37% increase in rates of non-fatal myocardial infarction, non fatal stroke or death from a vascular cause, and an 81% increase in upper gastrointestinal perforations, obstructions or bleeds.
Split into simpler sentences: Side effects include a 37% increase in incidence of major vascular events, which include non-fatal myocardial infarction, non fatal stroke or death from a vascular cause. Additionally there is an 81% increase in incidence of upper gastrointestinal complications which include perforations, obstructions or bleeds.