Parse processor not recognising multiple lines

I am trying a ParseCEF & a ParseSysLog processor with a text file and it falls down at the point of Parsing wrt only seeing the first line and then stopping. Are there any examples of parsing a text file to JSON and also recognising the multiple lines after the Parse processor so that there are multiple lines but in the same file. (I realise you can do a SplitText processor before the Parsing, but don't want to go this route.