Is the included sentence about party planning grammatically correct?

“Since you have asked me about the planning of a farewell party for your English teacher,I’m happy to help you with some suggestions.”

This is perfectly good if just a little long. There is nothing wrong with it. Some might suggest you leave out the comma but not me. I might go with “You're planning a farewell party for your English teacher. Since you have asked me I’m [I'll be] happy to help you with some suggestions.” Making two sentences out of this one makes it a bit easier to read or hear.