ComplexTypes.cs

    public abstract class Entity
    {
        public Guid Id { get; set; }
    }

    public class Customer : Entity
    {
        public Customer()
        {
            Orders = new List<Order>();
            Address = new Address();
        }

        public string Name { get; set; }
        public Address Address { get; set; }
        public string Email { get; set; }

        public virtual ICollection<Order> Orders { get; private set; }

        public Order AddOrder(Order order)
        {
            Orders.Add(order);
            order.Customer = this;
            return order;
        }
    }

    public class Order : Entity
    {
        public Order()
        {
            OrderDetails = new List<OrderDetail>();
            BillingAddress = new Address();
        }

        public virtual Customer Customer { get; set; }

        public DateTime PurchaseTime { get; set; }
        public Address BillingAddress { get; set; }

        public virtual ICollection<OrderDetail> OrderDetails { get; }

        public OrderDetail AddDetail(OrderDetail detail)
        {
            OrderDetails.Add(detail);
            detail.Order = this;
            return detail;
        }
    }

    public class OrderDetail : Entity
    {
        public virtual Order Order { get; set; }
        public string Description { get; set; }
        public decimal UnitPrice { get; set; }
        public int Quantity { get; set; }
    }

    public class Address
    {
        public string Street { get; set; }
        public string City { get; set; }
        public string State { get; set; }
        public string PostalCode { get; set; }
    }
    
    public class CustomerConfig : EntityTypeConfiguration<Customer>
    {
        public CustomerConfig()
        {
            Property(p => p.Address.Street).HasColumnName("Street");
            Property(p => p.Address.City).HasColumnName("City");
            Property(p => p.Address.State).HasColumnName("State");
            Property(p => p.Address.PostalCode).HasColumnName("PostalCode");
        }
    }

    public class OrderConfig : EntityTypeConfiguration<Order>
    {
        public OrderConfig()
        {
            Property(p => p.BillingAddress.Street).HasColumnName("BillingStreet");
            Property(p => p.BillingAddress.City).HasColumnName("BillingCity");
            Property(p => p.BillingAddress.State).HasColumnName("BillingState");
            Property(p => p.BillingAddress.PostalCode).HasColumnName("BillingPostalCode");
        }
    }