Explain the statement, 'The digital device used to separate the rich from the poor; now it separates parents from their children.' ​

Basically its saying that the "digital device" which is most likely the phone, used to be an indication of how wealthy you were, like if you had the latest iPhone, you had more money than the person that had the iPhone from 3 years ago. However now, since kids have phones at earlier ages, they are less invested in the relationship with their own parents, and more inclined to care about trivial things such as how many people liked their photo on social media.

Explanation:

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: b: b: b: b: b: b: b: b: b

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.