I usually try offer a solution foremost and not to ask why, but I'll make an exception here. What would be the benefit of doing this? I ask because I can't think of any that would over-ride the risk of not being able to pull it back together again in some form. Any portion of that number needed for comparison purposes is most likely retrievable using simple functions, and presumes you understand the importance of displaying/editing records in forms and not directly into tables.
If you want to split the first part into its own table, you'll have to replace it somewhere down the line by linking the record id of that table parent table with the suffix table records. Really, all that means is that you have additional tables, joins and fields for no reason that I can think of that would otherwise promote good normalization. The most basic idea wrt normalization is to not repeat records, keep related things in their respective tables, join them by a non-fluid characteristic and avoid data disconnects for when some things change (like when Ms. Jones becomes Mrs. Smith). I have really simplified the issue of course, but if you like, I'm sure between myself and others here, we could offer some good links on the subject if you'd like that.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.