I think there is some confusion.
I don't know of any reason to use both 'su' and 'sudo' in a command.
either you would 'su' to root or you would 'sudo' to run a singular command.
'su' is to change into superuser (root) until you exit.
'sudo' is to temporarily be superuser until the command is completed.
To use 'sudo' to run a command just type 'sudo <command>' and as long as
you have the user in the 'sudo' group ('adduser user sudo' as root) that
user will be able to run said command when they log back in.