batch file multiple actions under a if condition

You can use & to join commands and execute them on the same line.

So your syntax should look like:

if not exist MyFolderName ECHO "Create a folder" & mkdir MyFolderName

UPDATE

Or you can use labels to jump to a section containing the commands you want to execute, for example:

if not exist MyFolderName GOTO DOFILESTUFF
:AFTER
...
EXIT

:DOFILESTUFF
ECHO "Create a folder"
mkdir MyFolderName
GOTO AFTER

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