Three men are sitting on a beach dressed in orange with refuse carts in front of them.
Inmates are cleaning up a beach.
The men sitting with refuse carts in front of them does not necessarily mean that they are cleaning.
Just because the men are dressed in orange does not mean they are inmates. Just because they are in front of refuse carts does not mean they are cleaning up.
One does not know the men are inmates or that they are cleaning in sentence 1.