Five Options

Option #5 Create a complex sentence by connecting a dependent clause and an independent clause. The independent clause begins the sentence and is followed by a dependent clause with NO comma.

I would like to read the book although it's not available.

Option #1 Create a compound sentence with a comma and a coordinating conjunction.

I would like to read the book, but it's not available.

Option #3 Create a compound sentence by joining two independent clauses with a semi-colon, a conjunctive adverb, and a comma..

I would like to read the book; however, it's not available.

Option #2 Create a compound sentence by joining two independent clauses with a semi-colon.

I would like to read the book; it's not available.

Option #4 Create a complex sentence by connecting a dependent clause and an independent clause. The dependent clause begins the sentence and is followed by a comma.

Though it's not available, I'd like to read the book.