The data processing was conducted in a way that didn't ensure the appropriate security of the data itself. Meaning that anyone could access or alter it in an irreversible way (deletion, destruction).
the data processing was conducted in a way that didnt ensure the appropriate security of the data itself meaning that anyone could access or alter it in an irreversible way deletion destruction
 data process  conduct   way  didnt ensure  appropriate security   data  mean  anyone could access  alter    irreversible way deletion destruction