Simplify the following text for a Grade 9 native English-speaking person.
Original: While he took the longer route by way of Wisbech , he sent his baggage train , including his crown jewels , along the causeway and ford across the mouth of the Wellstream .
Simplified: While he took the longer route through Wisbech , he sent his luggage , including his crown jewels , along the seashore and across the mouth of the Wellstream where the water was not deep .