Improve wording of sentence in first part of tutorial series

pages/tutorial/tutorial-series/tutorial_tutorial-series_part-1-base-structure.md

@@ -103,7 +103,7 @@ In our PHP code, each person will be represented by an object of the following c
 {% endhighlight %}
 
 The important thing here is that `Person` extends `DatabaseObject`.
-Additionally, we implement the `IRouteController` interface that allows us to use `Person` objects to create links and implement PHP's magic [__toString()](https://secure.php.net/manual/en/language.oop5.magic.php#object.tostring) method for convenience.
+Additionally, we implement the `IRouteController` interface, which allows us to use `Person` objects to create links, and we implement PHP's magic [__toString()](https://secure.php.net/manual/en/language.oop5.magic.php#object.tostring) method for convenience.
 
 For every database object, you need to implement three additional classes:
 an action class, an editor class and a list class.