Answer: The two independent clauses provided can be combined by writing "Jonas has homework, but it isn’t finished" or "Jonas has homework that isn’t finished".
Step-by-step explanation: An independent clause is made up of a subject and a verb and it expresses a full idea. Independent clauses can be combined into one sentence by following certain rules. For example, two independent clauses can be joined by adding a comma and a coordinating conjunction between them. This is the case of the sentence "Jonas has homework, but it isn’t finished" ("but" is the coordinating conjunction). Another way of combining both clauses is transforming one of these independent clauses into a dependent clause as in "Jonas has homework that isn’t finished" ("that isn't finished" is the dependent clause). However, two independent clauses cannot be joined only by means of a comma.