Q: Valid English sentence (grammatically) or not: Kim to beat his dog and alienated cats.

A: unacceptable

Q: Valid English sentence (grammatically) or not: The stone smashed the cup apart.

A: acceptable

Q: Valid English sentence (grammatically) or not: Sam picked those packages up which are to be mailed tomorrow rest might, but he didn't want to do so until it had stopped raining.

A:
acceptable