[1] [I don't [like [cooking ready meals]]].
There are three clauses in [1], as bracketed, two of which are subordinate. The outer set of brackets surround the matrix (main) clause, i.e. the whole sentence. The next set surround the subordinate "like" clause functioning as complement of "don't". The inner set surround the subordinate "cooking" clause functioning as complement of "like". Elementary grammar calls this a complex sentence.
[2] [I don't [like [to cook ready meals]]].
This has the same structure as [1], except that the to cook subordinate clause is an infinitival clause, as opposed to the gerund-participial (ing) clause in [1].
[3] [What I wish for them] is [the same (that) I wish for you].
This consists of two noun phrases (bracketed) linked by the copular verb "be".The first NP functions as subject, the second as subjective predicative complement of "be". Both noun phrases contain an embedded relative clause. Elementary grammar calls this a simple sentence.
[4] [I believe [that I won it]].
This consists of two clauses, one of which is subordinate. The outer brackets surround the matrix (main) clause, i.e. the whole sentence. The inner brackets surround the subordinate that clause functioning as complement of "believe". Elementary grammar calls this a complex sentence because it consists of a main clause and a subordinate one.