The 'Uplevelling Sentences' document has different settings for you describe. You can pick your favourites. You will need to add precise adjectives (words which describe a noun), fronted adverbials and subordinating conjunctions to improve these sentences.
There is a fronted adverbials sheet and an adjective sheet to help. You could also use an online thesaurus to find interesting adjectives.
Remember to add the comma before the main clause when you add a fronted adverbial and conjunction to the start of your sentences - be amazing!!