[Alex_Valde]

Use this:

pawn Code:

stock UnderscoreToSpaceName(playerid)
{
    new Name[MAX_PLAYER_NAME];
    if(IsPlayerConnected(playerid))
    {
        GetPlayerName(playerid, Name, sizeof(Name));
    }
    else
    {
        Name = "Disconnected/Nothing";
    }
    for(new name = 0; name < MAX_PLAYER_NAME; name++) if(Name[name] == '_') Name[name] = ' ';
    return Name;
}

So the command will look like this:

pawn Code:

new msg[256];
        if (sscanf(params, "s", msg)) SendClientMessage(playerid, COLOR_RED, "USAGE: /ann [text]");
        else {
            format(msg, sizeof(msg), "Announcement from %s: %s", UnderscoreToSpaceName(playerid), msg);
            SendClientMessageToAll(COLOR_LOCALMSG, msg);
            }
            }
    return 1;
}