Complex sentence: Bile salts secreted from the liver and stored in gallbladder are released into the duodenum where they coat and emulsify large fat droplets into smaller droplets, thus increasing the overall surface area of the fat, which allows the lipase to break apart the fat more effectively.
Split into simpler sentences: Bile salts secreted from the liver and stored in gallbladder are released into the duodenum where they coat and emulsify fat droplets. Making the droplets small, and their surface area greater, allowing the lipase to break apart the fat more effectively.