Split files in NeroVision express 2

Hi everyone,
I’m glad I found this forum. Great stuff!! I split a couple of large video files which took up most of my hard drive space once they were finished. The original file was 900mb before being split. Can someone please tell me what I need to do to keep these split files to a ‘normal’ size that can be burnt to VCD??
Thanks a lot & take care,
Nat

I’m really sorry. I didn’t realise I posted in the wrong place.
My apologies & thanks again,
Nat