|"I would like to recover the unallocated space back to the basic partition which has a number of files on it."|
You will need data recovery to do that. Look at the lower left here for Data Recovery.
" I would rather, merely add the unallocated space to the basic drive."
Um to do the file recovery you have to recover the entire partition. You are going to format the drive after the file recovery. You would simple remove all partitions, create one large one and format. This would result in what you desire.
So how did dynamic disks come into the mix?