pause sikuli until another finish

if you know the places, where the second scipt should run, the the easiest (and fastest) way is to put the complete code of the second script into a def (function) and call it when needed.

# second script now:
click()
wait
# and more

# second script as def (named second.sikuli)
from sikuli import *
def runScript():
    click()
    wait()
    # and more

as you can see, after the def line all lines have to be indented once (select all lines and press tab)
see faq 1800 about indentation

# your first script now:
import second
# now your existing code
second.runScript() # this will execute your second code and come back when finished

Take care: all images in both scripts must have different filenames if they are different (no problem if you leave the automatic naming as timestamp)

about this solution:
http://sikulix-2014.readthedocs.org/en/latest/globals.html#importing-other-sikuli-scripts-reuse-code-and-images
especially: use reload() if you are changing second in IDE while running the main script in the same IDE session.