I think you can't have a subordinate independent clause. A subordinate clause is a clause which is dependant on another clause it can't stand alone as a sentence. An independent clause can stand alone as a sentence.
Nonrestrictive element.
A sentence with one main clause and one or more dependent clauses is a complex sentence. This type of sentence has one independent clause that can stand alone as a complete sentence, along with one or more dependent clauses that rely on the main clause for meaning.
The sentence type that includes both a subordinate clause and an independent clause would be a complex sentence. You would need to insert a conjunction to separate the two clauses for the sentence to be grammatically correct.
,and ,or ,but
Recognize a clause when you see one. Clauses come in four types: main [or independent], subordinate [or dependent], relative [or adjective], and noun. Every clause has at least a subject and a verb. Other characteristics will help you distinguish one type of clause from another.
what is the clauses, sentence type, and sentence purpoes
complex sentence
Not a simple sentence, but a compound, complex or compound-complex may have its principal or independent clause in inverted order within the sentence.
The sentence "That was the reason why he came late" is a complex sentence, as it contains an independent clause ("That was the reason") and a dependent clause ("why he came late").
Simple
Simple