Complex sentence: Their design was based on the U.S. Navy Long Island class escort carrier (AVG1) to differentiate between the two classes the Royal Navy ships were prefixed with a'B' (BAVG).
Split into simpler sentences: Their design was based on the U.S. Navy Long Island class escort carrier (AVG1). To differentiate between the two classes, the Royal Navy ships were prefixed with a'B' (BAVG).