Simplify the following text for a Grade 10 native English-speaking person.
Original: Shortly thereafter , the machine originally described by von Neumann 's paperâ '' EDVACâ '' was completed but did not see full-time use for an additional two years .
Simplified: Shortly afterwards , the machine originally described by von Neumann 's paperâ '' EDVACâ '' was completed but was not ready for two years .