using COALESCE to combine multiple columns into a single column.

I have a very large query that currently contains many subqueries. One of my subqueries returns several rows. I want to take each row and combine it into one column. I also want to grab several columns per row and combine them. So I'm looking for my data to appear in the columns like this. The current query below is what I was going to use if I put the data in its own table, but then I found the command COALESCE and wondered how I could accomplish what I want without creating a new table. ec.OWNER = '' would have an owner from the main query to tie together.

CAR,MODEL,DATE_ACQUIRED,YEARSACQUIRED |CAR,MODEL,DATE_ACQUIRED,YEARSACQUIRED |
CAR,MODEL,DATE_ACQUIRED,YEARSACQUIRED

select ec.CAR, ec.MODEL, ec.DATE_ACQUIRED,
(select DATEDIFF(YEAR,max(DATE_ACQUIRED),GETDATE()) from PROD.dbo.EMPCODES where CAR=ec.CAR AND TYPE='CE' and EMP_APP = 0 and MODEL=ec.MODEL) AS YEARSACQUIRED
from PROD.dbo.EMPCODES ec where TYPE='CE' and EMP_APP = 0 and MODEL in ('TY','FD', 'AU', 'CV')
and ec.OWNER = '')

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