Simplify the following text for a Grade 13 native English-speaking person.
Original: An example of how the ivory trade causes poaching pressure is in the eastern region of Chadâ '' elephant herds where as recently as 1970 there was an estimated population of 400,000 ; however , by 2006 the number had dwindled to about 10,000 .
Simplified: An example of this poaching pressure is in the eastern region of Chadâ '' elephant herds there were substantial as recently as 1970 , with an estimated population of 400,000 ; however , by 2006 the number had dwindled to about 10,000 .