Simplify the following text for a Grade 9 native English-speaking person.
Original: Tens of thousands of people lined the subsequent procession route to Robinson 's interment site at Cypress Hills Cemetery in Brooklyn , New York , where he is buried next to his son Jackie and mother-in-law Zellee Isum .
Simplified: Tens of thousands of people lined the procession route that followed to Robinson 's gravesite site at Cypress Hills Cemetery in Brooklyn , New York . There he is buried next to his son Jackie and mother-in-law Zellee Isum .