Simplify the following text for a Grade 7 native English-speaking person.
Original: The indirect way of development is known to end in an extended pelagic plankotrophic tornaria larval stage , which means that this hemichordate exists in a larval stage that feeds on plankton before turning into an adult worm .
Simplified: The indirect development is ends in an long pelagic larval stage . This means that these species have a larval stage which feeds on plankton before turning into an adult worm .