Simplify the following text for a Grade 8 native English-speaking person.
Original: Monroe severed contact with her drama coach , Natasha Lytess , replacing her with Paula Strasberg , who became a constant presence during the filming of Monroe 's subsequent films .
Simplified: Monroe stopped working with her drama coach , Natasha Lytess , and replaced her with Paula Strasberg . Strasberg was always on set during the filming of Monroe 's subsequent films .