using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        List<Match> matchList = new List<Match>();

        var messageOrel = new List<MatchMessage>

        {

            new MatchMessage { SentDate = "01/12/2016" },

            new MatchMessage { SentDate = "01/11/2016" },

            new MatchMessage { SentDate = "01/20/2016" },

        };

        var messageTom = new List<MatchMessage>

        {

            new MatchMessage { SentDate = "01/30/2016" },

        };

        var messageJordan = new List<MatchMessage>

        {

            new MatchMessage { SentDate = "01/01/2015" },

            new MatchMessage { SentDate = "01/05/2015" },

        };

        var messageBill = new List<MatchMessage>

        {

        };

        matchList.Add(new Match { Name = "Orel", Messages = messageOrel });

        matchList.Add(new Match { Name = "Tom", Messages = messageTom });

        matchList.Add(new Match { Name = "Jordan", Messages = messageJordan });

        matchList.Add(new Match { Name = "Bill", Messages = messageBill });

        var newList = matchList.OrderBy(match => match.Messages.Any() ? match.Messages.Max(x => DateTime.Parse(x.SentDate)) : DateTime.MaxValue);

        foreach (var match in newList)

        {

            Console.WriteLine(match.Name);

        }

    }

    public class Match

    {

        public string Name { get; set; }    

        public List<MatchMessage> Messages { get; set; }

    }

    public class MatchMessage

    {

        public string SentDate { get; set; }

    }

}