If you work on large text or log files that you are unable to handle because of its large size or the lines of text inside, then here are the tools that can help you on this. Using these tools you can split the large file into multiple small files.
GSplit is a free reliable file splitter that lets you split your large files (like Self-Extracting archives, Zip archives, disk images, multimedia, music, video, backup, image, archive, log, large text, document files) into a set of smaller files called pieces.
You can use this tool to split large, very large, text, csv and many other files. This one is definitely worth a try.
A very simple text splitter that can split text based files (txt, log, srt etc.) into smaller chunks. Even abort the process whenever you want to.