Question

After they got off of the school bus the children dropped their backpacks on their front porches yelled hello to their parents and then we’re running towards the playground

Answer 1

I'm guessing your asking for a grammar check? If so then...

After the children left the school bus, they dropped their bags on the front proches of their houses. The children yelled "Hello!" to their mothers and fathers and ran towards the playground to play tag with each other.