Answer:
My neighborhood stays the same, but I change every day.
I believe that change is good, yet it happens so fast.
Although I'm getting older, I still like to play outside.
Step-by-step explanation:
Complex sentences includes one dependent (not applicable as a single sentence) and one independent (can be a single sentence) clause connected by a conjunction.
Independent - My neighborhood stays the same
Dependent - but I change every day
Independent - I believe that change is good
Dependent - yet it happens so fast
Independent - I still like to play outside
Dependent - Although I'm getting older
"Tomorrow begins a new day; I know it will be full of fun" is a compound sentence since it connects two independent clauses with a semi-colon.