&& is used to concatenate shell commands. Put that between the commands. You can also use ; as concatenation but then the result of the first command won't affect the second (as far as I know, look in the documentation for the busybox).

EDIT:
And to understand why the second of your versions won't work, have a look at what you've actually written. You're trying to copy unwanted things to unwanted places. This might very well end up doing bad things with the system.