Skidmore Guide to Writing Index
A semicolon can be used
Kate liked to take long walks on the beach; Alex preferred building sandcastles.
Kate liked to take long walks on the beach; however, Alex preferred building sandcastles.
Note: Since "however" is NOT a conjunction, it cannot be used only with a comma to join two independent clauses.
Keep in mind, a period could be used in either of the above examples. If you choose to use semicolons to join clauses, you're really making a stylistic choice rather than a grammatical one. And don’t forget, you shouldn't capitalize the first letter of the word that follows a semicolon unless it is a proper name.
Tracy brought her pet hamster, Pickles; her three hundred CDs; and her antique, mahogany lounge chair to her dorm room.
Since two items in this list contain commas, using commas as a separator will cause confusion for the reader.
Note: Do not use a semicolon to join a phrase or incomplete sentence to an independent clause.
Wrong: Alex liked to build sandcastles on the beach; which was how he spent last summer.
Correct: Alex liked to build sandcastles on the beach, which was how he spent last summer.