Split 1st & Last Names & Split Addresses After 1st Comma

I'm using Excel 2000 and I have a spreadsheet with 4 columns (A-D) and many (500+) rows.

Part 1:
#########################################
Colums A & B both contain identical data - a first name and a last name in the format "John Doe".

I want the second word ("Doe") removed from all cells in Column A so that only the first name remains, and I want the first word ("John") to be removed from every cell in Column B so that only the last name remains.

So, where A1 & B1 both started with the data "John Doe" now A1 contains only "John" and B1 contains only "Doe".
#########################################

Part 2:
####################################################
Column C contains addresses in the format:
"#5 - 123 Fake Street, Some City, CA 90210"

There is ALWAYS a comma and a space after the street address, then the name of the city or town followed by more data which may include one or more commas.

I would like everything BEFORE the first comma to remain in column C, and everything AFTER the first comma & space to be moved into Column D of the same row. The first comma and space are not needed again.

So, where C1 started with "#5 - 123 Fake Street, Some City, CA 90210", it now only contains "#5 - 123 Fake Street" and D1 now contains "Some City, CA 90210".
####################################################