Simplify the following text for a Grade 14 native English-speaking person.
Original: Oomycetes occupy both saprophytic and pathogenic lifestyles and include some of the most notorious pathogens of plants , causing devastating diseases such as potato blight and sudden oak death .
Simplified: Oomycetes occupy both saprophytic and pathogenic lifestyles â `` and include some of the most notorious pathogens of plants , causing devastating diseases such as late blight of potato and sudden oak death .