using System;
using System.Globalization;
using System.Linq;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;
 
public class Test
{
    public static void Main()
    {
            var originalList = new List<string>(){"split","1","split","2","2","split","3","3","3"};
            var result = new List<List<string>>();
            List<string> subList = new List<string>();
            foreach(string str in originalList)
            {
                if(str=="split")
                {
                    subList = new List<string>();
                    result.Add(subList);
                }
                subList.Add(str);
            }
            foreach(List<string> chunk in result)
                Console.WriteLine("[{0}]",string.Join(",", chunk.ToArray()));
    }
}