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Should I put commas in sentences like this?
The price of software is defined(,) based on...
The amount is calculated(,) based on...
computers(,) developed by...
approvals for advertising and marketing activities(,) related to...
If it's a complicated question, what should I read to understand the rules?
Having a passive voice has nothing to do here. I believe you need to study how the adjective phrases are omitted and reduced.
