[Storm33229]

if( ((from != null) || (from.Map != Map.Internal)) || (!from.Deleted) )
{
    //action code
}

and

if( from != null )
{
    if( from.Map != Map.Internal )
    {
        if( !from.Deleted )
        {
            //action code
        }
    }
}

are two completely different things.
The first one performs the action code if: from is not null, or if map is not internal or if from is not deleted.

However, the second one:
If from isn't null check if the map is internal, if not: check if from is not deleted.

For both of them to be the same the first one needs to be changed to:

if((from != null) && (from.Map != Map.Internal) && (!from.Deleted))
{
//action code
}

-Storm