She decided to bake a chocolate cake. She took the ingredients out of the fridge and sat them on the table. She finished cooking it an hour later.
Notice how the structure of each is practically the same? Boring!!!! It is too vanilla. You want more depth in your writing than this. And it can be loads of fun to do.
Here’s a few ideas:
She decided to bake a chocolate cake. Taking out the ingredients from the fridge, she put them on the table. An hour later, the cake was done.
See how much better it reads? The writing is more mature and flows better. First drafts might be more like that first example, but after you go through it make it sound more like the second example.
Use clauses in front of the main body of the sentence. Use an object or an emotion as the subject of the sentence instead of the person. Instead of “She looked over at him when he walked into the room” use “Her eyes met his as he entered the room.” The eyes are now the subject of the sentence, but it varies how your sentences read.
Sentences should never be repetitive in style. Okay, maybe not ‘never’. Sometimes it is appropriate, but that is rare. Try to have your sentences start off in different ways and are phrased differently.