using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        PetOwner[] petOwners = 

        { 

            new PetOwner { Name="Higa, Sidney", 

              Pets = new List<string>{ "Scruffy", "Sam" } },

            new PetOwner { Name="Ashkenazi, Ronen", 

              Pets = new List<string>{ "Walker", "Sugar" } },

            new PetOwner { Name="Price, Vernette", 

              Pets = new List<string>{ "Scratches", "Diesel" } } 

        };

        var flattnedList = petOwners.SelectMany(x => x.Pets.Select(y => new{owner = x.Name, pet = y}));

        foreach(var fl in flattnedList){

            Console.WriteLine(fl.owner+" - "+fl.pet);

        }

​

    }

}

​

class PetOwner

{

    public string Name { get; set; }

    public List<String> Pets { get; set; }

}