I have a spreadsheet with 9500 rows of data.

The rows look like this:
305-129, Bill, Smith, $50
305-129, Bill, Smith, $250
305-129, Bill, Smith, $100
005-277, Mary, Maze, $100
005-277, Mary, Maze, $500

I need the rows to look like this:
305-129, Bill, Smith, $50, $250, $100
005-277, Mary, Maze, $100, $500

There are many more columns, but thats the idea. I need to merge all the
rows so that each person with their unique ID number has the entire string of
information in one row. Right now for every donation, the person has a row,
so one person with 10 donations has 10 lines. I need all 10 donations in the
same row.

Any help would be greatly appreciated!