Broken cocoons, partially joined ones, or those spun by two caterpillars together are inferior, and used much like cotton or wool to make spun silk.
(Broken cocoons; joined; ones) (those; spun together; by two caterpillars) (those spun by two caterpillars together; are; inferior) (Broken cocoons; used; to make spun silk)
Broken cocoons those those spun by two caterpillars together Broken cocoons
joined spun together are used
ones
by two caterpillars
inferior
to make spun silk