A group of people standing outside a building .
a old man was talking
A group of people standing outside a building.
a old man was talking
The group of people might very well include an old man. (note: this is pretty weak; really, there is nothing in sentence 2 that can be seen as a consequence of the first)
The group of people might very well include an old man . ( note : this is pretty weak ; really , there is nothing in sentence 2 that can be seen as a consequence of the first )