This is the longest sentence I have ever written:

At my home, underneath the table, on my bed, in the rooms across the yard, near my dog, above the bridge, beside my book, beside the lamp, under my shoes, at the school,m around the desk, behind my friend's locker, beneath the chair, with my teacher, in my locker is where I looked for my homework; but after I looked at my home underneath the table, on my bed, in the rooms across the yard, near my dog, above the bridge, beside my book, beside the lamp, under my shoes, at the school,m around the desk, behind my friend's locker, beneath the chair, with my teacher, in my locker, I found our the teacher didn't hand it out yet!

Why don't you try to write a long sentence? You can write it in the comments...

P.S: Use MANY propositional phrases.