Simplify the following text for a Grade 8 native English-speaking person.
Original: Thus , soon after his death , his estate , which had been worth nothing on his deathbed , grew to an estimated value of $ 2,000,000 as the movie rights for My Fair Lady ( which was filmed in 1964 ) were also quickly optioned .
Simplified: Thus , soon after his death , his estate , which had been worth nothing on his deathbed , grew to an estimated value of two million dollars .