Step 1: Take a box and stretch it as shown.

Step 2: Drag another box and place as shown below.

Step 3: Drag a roof shape and align it at the top of second box.

Step 4: Drag round roof from the shapes.

Step 5: Align this at the top of other box.

Step 6: Grab another hole box and change its dimensions to make a door.

Step 7: Align it as shown below.

Step 8: Similarly, create windows on the other side of box.

Step 9: Finally group all the shapes together.

The result is:

So, our strategy here is to combine many basic shapes to create a more complex outline.

Similarly, you can go for many complex shapes.