SQL create split function and how to use function in sql

ALTER FUNCTION [dbo].[Split](@String varchar(8000), @Delimiter char(1))      
returns @temptable TABLE (items varchar(8000))      
as      
begin      
    declare @idx int      
    declare @slice varchar(8000)      
     
    select @idx = 1      
        if len(@String)<1 br="br" is="is" nbsp="nbsp" null="null" or="or" return="return" tring="tring">     
    while @idx!= 0      
    begin      
        set @idx = charindex(@Delimiter,@String)      
        if @idx!=0      
            set @slice = left(@String,@idx - 1)      
        else      
            set @slice = @String      
         
        if(len(@slice)>0) 
            insert into @temptable(Items) values(@slice)      
 
        set @String = right(@String,len(@String) - @idx)      
        if len(@String) = 0 break      
    end  
return      
end 
GO


--- How to call the function

select * from [dbm].[Split] ('L196,L201,L197',',')

separate first & last name using space, SQL, SPLIT

select
SUBSTRING(elg.FirstName, (CHARINDEX(' ', elg.FirstName) + 1),LEN(elg.FirstName)) AS [LastName]
,rtrim(ltrim(SUBSTRING(elg.FirstName, 1,CHARINDEX(' ', elg.FirstName)))) AS [FirstName]
,elg.FirstName
,elg.LastName
from dbm.EgLoads elg
where elg.BatchId='{207c6838-fe87-40d1-9353-0d60055c93f2}'
and LEN(SUBSTRING(elg.FirstName, (CHARINDEX(' ', elg.FirstName) + 1),LEN(elg.FirstName))) < = 2
and len(elg.FirstName) <> 1