To combine all records from one or multiple resultsets use UNION [ALL]

To combine all columns from one or multiple resultsets use JOIN (eg. INNER, LEFT/RIGHT OUTER, FULL OUTER)

If you cannot JOIN two resultsets you want to combine (columns wise), use UNION with selecting NULL's in the first resultset for columns from second resultset (it will combine all columns and rows):

SELECT r1.Col1, r1.Col2, ... r1.ColN, NULL, NULL, ... NULL

FROM (SELECT Col1, Col2, ... ColN

FROM ...whatever WHERE ...whatever) r1

UNION ALL

SELECT NULL, NULL, .... NULL, r2.Col1, r2.Col2, ... r2.ColN

FROM (SELECT Col1, Col2, ... ColN

FROM ...another whatever WHERE ...another whatever) r2

If my answer is not clear (or irrelevant), please provide involved objects DDL, setup of sample data, clear output based on sample data provided and your query in a current state as per article from the link at the bottom of my signature 😉