Help with sentence, please.

Sorry, I forgot to post the actual sentence.

When switchgrass is used for a biofuel, it is possible to harvest the following spring, as this reduces the amount of ash and moisture in the biomass.

Anonymous In the following sentence, are the commas correct? What is the subject? We are debating over this, so any insight as to why it is correct or incorrect will be greatly appreciated. Thank you in advance.

It's not clear which sentence you would like us to pass judgment on, or did you forget to include it?

CJ

Yes, sorry I forgot it in the original post and then put it in the next reply.

The sentence is: When switchgrass is used for a biofuel, it is possible to harvest the following spring, as this reduces the amount of ash and moisture in the biomass.

Again, thank you. This analysis will greatly help me and my brother.

AnonymousSorry, I forgot to post the actual sentence.When switchgrass is used for a biofuel, it is possible to harvest the following spring, as this reduces the amount of ash and moisture in the biomass.

The subject of the main clause is "it." The commas are OK.
The subject of the first clause is "switchgrass."
The subject of the last clause is "this.

AnonymousWhen switchgrass is used for a biofuel, it is possible to harvest the following spring, as this reduces the amount of ash and moisture in the biomass.

The commas are OK, though you don't really need the second one. The sentence is fine, but I have questions:

Maybe it should be written "used as a biofuel"?

To harvest what? It