Complex sentence: In some cases, the foot is denoted by a prime, which is often approximated by an apostrophe, and the inch by a double prime; for example, 2 feet 4 inches is sometimes denoted as 2 ′ 4.
Split into simpler sentences: In some cases, the foot is denoted by a prime, which is often approximated by an apostrophe, and the inch by a double prime. For example, 2 feet 4 inches is denoted as 2 ′ 4.