helping to keep/help to keep

Its insurance arm is also a huge holder of Japanese government bonds, indirectly helping to keep interest rates low on Japan's mountain of sovereign debt, while its postal service is a political asset that employs more than 200,000 people.
More:Japan govt aims to list Japan Post in three years | Reuters
Can I replace the bold phrase by the following?
"indirectly help to keep interest rates low on Japan's mountain of sovereign debt"
Is there any grammar rule related to it?

Quote:

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Originally Posted by anhnha

Can I replace the bold phrase by the following?
"indirectly help to keep interest rates low on Japan's mountain of sovereign debt" No
Is there any grammar rule related to it?

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A participial phrase is what is required here, not a finite verb without a subjct.

Well, thank you!
I have searched the phrase "participial phrase" and found a great site discussing about this. It is here:The Participle Phrase