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public function defineContentAttribute()
{
    return AttributeType::Mixed;
}

public function defineContentAttribute()
{
    return false;
}

The other approach for saving complex values is to have your FieldType use a custom database table. Explaining this in any great detail is impossible without knowing a lot more about your particular use case and a good overview is already given in Ben Parizek's great answer to a similar question – but here's the gist of it:

The other approach for saving complex values is to have your FieldType use a custom database table. Explaining this in any great detail is impossible without knowing a lot more about your particular use case and a good overview is already given in Ben Parizek's great answer to a similar question – but here's the gist of it:

Note that there are other aspects to consider as well, such as offloading the business logic in saving and retrieving the data to a service layer (a good idea), and using Models to pass data between records, the service layer and your templates (a very good idea), but it's a bit out of scope for an SE answer like this. In any case, I hope the above will get you up and running.

Note that there are other aspects to consider as well, such as offloading the business logic in saving and retrieving the data to a service layer (a good idea), and using Models to pass data between records, the service layer and your templates (a very good idea), but it's a bit out of scope for an SE answer like this. In any case, I hope the above will get you up and running. In any case, if you simply need to two text fields, I'd go with the first approach – it's way easier.