Here's a simple essay about "How I Spent My Summer" suitable for a 4th-grade level:
This summer, I had a lot of fun. First, I went to the beach with my family. We swam in the ocean and built sandcastles. I also visited my grandparents and played games with my cousins. Finally, I read some exciting books at home and enjoyed my time off from school.
This essay is straightforward and consists of five easy sentences that describe summer activities.