Three different behaviors that you made:
1.  There are buses that periodically drive to and stop at the bus stop.
2.  There are pedestrians that sometimes get onto the buses, sometimes depart,
    and sometimes there is no one.
3.  There is a truck that periodically delivers 1-3 packages at the power
    productivity station.

One behavior that is not simple:
Not simple:
-   When there is a package, drones will go to deliver them to the front door
    of a random building, using a grappling arm, and depending on whether there
    are more packages to deliver or not, the drone will either continue with
    deliveries or go back to the station.

Animated Articulated Figure:
Articulated:
-   The drone grappling arm is articulated as there is a rope that can descend
    from the drone body and a hook at this end of this rope that can hold to
    packages by closing/opening.

Other Behaviors that you made: (backup in case something above doesn't count)
-   There is a helicopter that periodically flies to different destinations of
    the city to ensure no accidents from the new drone program have occured. It
    maintains a safe distance at a safe level to other objects (advanced).
-   After packages are delivered, they dissapear as they are taken indoors
    (basic).
-   Every 30 seconds, clouds appear and it starts raining. The lighting also
    darkens. Then after 30 seconds, the clouds fade away, the lighting slowly
    increases, and the rain stops (basic/advanced).
-   When it starts raining, helicopters will fly back to the station and drones
    will deliver their current package and also fly back. The river will rise
    in depth, going faster and the turbines will also spin faster. The shiny
    luster of the river will dissapear since it becomes cloudy (advanced).