returning more than one value from a function

Greetings,
I'm attempting to create a PL/PGSQL function with an IF/THEN
conditional. Basically, all I really need is the ability to run a
long/complex SQL query based on the value of the newest row of one
column in a specific table (if its equal to 1 then run the SQL, if
anything else don't run it). In pseudo code, something like:

CREATE OR REPLACE FUNCTION foo0 RETURN text AS $$
IF (SELECT current_status from table0 WHERE id in (SELECT max(id) FROM
table0))='1' THEN
<LONG SQL QUERY>
END IF;
LANGUAGE 'plpgsql' ;

This seems like a fairly simple requirement, yet I can't find any way
to do this without creating a function. The problem is that the
long/complex SQL query needs to return multiple columns of output (not
just a single value), and functions can only return a single
value/column, so I'm a bit stuck on how to make this work.

Is there an alternative solution that I'm missing?

thanks!