Here is your paragraph written normally, with all the articles in italics.
<em>The</em> highest mountain in Great Britain is <em>the</em> Ben Nevis, which is situated in <em>the</em> Grampians (a mountain range).
<em>The</em> Pennines are <em>the</em> mountains situated in <em>the</em> central part of Great Britain. They are separated from <em>the</em> Southern Uplands by <em>the</em> valley of River Tyne. <em>The</em> Tyne flows into <em>the</em> North Sea.
<em>The</em> mountain range called <em>the</em> Cambrians is in Wales. <em>The</em> highest mountain in <em>the</em> Cambrians is <em>the</em> Snowdon.
<em>The</em> longest river in Great Britain is <em>the</em> Severn. It rises in <em>the</em> Cambrians and flows into <em>the</em> Bristol Channel. <em>The</em> River Thames is not as long as the Severn but it is <em>the</em> most important river in Great Britain. London, <em>the</em> capital of the United Kingdom, is situated on <em>the</em> Thames.
Next time, please use an image to text generator and paste that into your lesson, so your answerer doesn't have to do that or retype it or anything.
Answer: Complex sentence.
Explanation: a complex sentence is a sentece formed by an independent clause (a phrase that has complete meaning on its own) and at least one subordinate or dependent clause (a phrase that doesn't have completin the given excerpt meaning on its own). In the given sentence we have a subordinate clause: "While I was cleaning out my closet the other day" and an independent clause: "I came across my favorite pair of childhood shoes: purple and black jellies with gold buckles."
Repairing old appliances, reusing something saves resources