Practice saying it
"I help [these people] achieve [this result] through [these things I do for them]."
Obviously you'll make it sound a lot less like it contains brackets.
The main thing is to focus on the value/result you bring to the client. What difference do they see?
Try and use normal words too, not specialist jargon or words reeled off by a thousand online 'entrepreneurs'.
Write it down. Practice. It should just trip of your tongue.