Realtive clause

Hello,

A) Payasam is a sweet dish. It is made of rice, jaggery and milk.

I have to combine the above sentences using realtive clause.

1. Payasam is a sweet dish which is made of rice, jaggery and milk.

2.Payasam which is made of rice, jaggery and milk is a sweet dish.

B) He brings joy in mother's life. Ram is a postman.

1) Ram is a postman who brings joy to mother's life.

2) Ram who is a postman brings joy to mother's life.

I have tried to combine the (A) and (B) using relative clause.

which option is correct?

Is a realtive clause subordinate or coordinate clause?

Thanks.