In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
One example: The Inheritance Cycle is a series of fantasy books written by Christopher Paolini.
Solution is here: The Inheritance Cycle is a tetralogy of young adult high fantasy novels written by American author Christopher Paolini.
Explanation: The output sentence elaborates on the input sentence without changing its general meaning e.g. "tetralogy of young adult high fantasy novels".

Now, solve this: Whereas other theropods walked with three toes on the ground , fossilized footprint tracks show that most dromaeosaurs held the second toe off the ground , with only the third and fourth toes bearing the weight of the animal .
Solution:
However , whereas most theropods walked with three toes contacting the ground , fossilized footprint tracks confirm that many early paravian groups , including the dromaeosaurids , held the second toe off the ground in a hyperextended position , with only the third and fourth toes bearing the weight of the animal .