Simplify the following text for a Grade 8 native English-speaking person.
Original: Today , the term Lessepsian migration is used more broadly for any migration of animals over man-made structures .
Simplified: On a wider context , the term `` Lessepsian migration '' is used to describe any animal migration over man-made structures , i.e. that which would not have occurred had it not been for the presence of an artificial structure .