//On top of your script:
#define MAX_CHARS_PER_LINE 80
#define FINAL_DOTS

//somewhere outside functions:
stock sendLongMessage( playerid , color , message[] )
{
    new len = strlen(message),
        _iL = len / MAX_CHARS_PER_LINE;

    if( ( len % MAX_CHARS_PER_LINE ) ) _iL++;
    new _Line[MAX_CHARS_PER_LINE + 5];

    new _:_i@Index;
    while( _i@Index < _iL )
    {
        if( _i@Index == 0 )
            strmid( _Line, message, ( _i@Index * MAX_CHARS_PER_LINE ), ( _i@Index * MAX_CHARS_PER_LINE ) + MAX_CHARS_PER_LINE );
        else
            strmid( _Line, message, ( _i@Index * MAX_CHARS_PER_LINE ), ( _i@Index * MAX_CHARS_PER_LINE ) + MAX_CHARS_PER_LINE );

        #if defined FINAL_DOTS
        if( _iL > 1 )
        {
            if( _i@Index == 0 )
            {
                format( _Line, sizeof _Line, "%s ...", _Line );
            }
            else if( _i@Index > 0 && ( _i@Index + 1 ) < _iL )
            {
                format( _Line, sizeof _Line, "... %s ...", _Line );
            }
            else
            {
                format( _Line, sizeof _Line, "... %s", _Line );
            }
        }
        #endif
        ////////////
        SendClientMessage( playerid, color, _Line );
        ///////////
        _i@Index++;
    }
    return 1;
}
//Credits to Miki