Merge pull request #4172 from kevin8999/patch-1

fix: Fix grammatical error in part1a.md

Author: vejol

src/content/1/en/part1a.md

@@ -291,7 +291,7 @@ const App = () => {
 
 **NB**: <em>export</em> at the bottom is left out in these <i>examples</i>, now and in the future. It is still needed for the code to work
 
-Writing components with React is easy, and by combining components, even a more complex application can be kept fairly maintainable. Indeed, a core philosophy of React is composing applications from many specialized reusable components.
+Writing components with React is easy, and by combining components, an even more complex application can be kept fairly maintainable. Indeed, a core philosophy of React is composing applications from many specialized reusable components.
 
 Another strong convention is the idea of a <i>root component</i> called <i>App</i> at the top of the component tree of the application. Nevertheless, as we will learn in [part 6](/en/part6), there are situations where the component <i>App</i> is not exactly the root, but is wrapped within an appropriate utility component.