There are a number of ways to correct run-on sentences:

1. Use two separate sentences.
   My sister Julie loves to write. She has had several short stories published.
2. Use a coordinating conjunction and a comma. These are the most common coordinating conjunctions
   • and
   • but
   • for
   • nor
   • or
   • so
   • yet

   My sister Julie loves to write, and she has had several short stories published.

3. Use a subordinating conjunction. These are the most common subordinating conjunctions:
   • after
   • although
   • as
   • because
   • before
   • if
   • since
   • unless
   • until
   • when
   • whereas
   • while

   My sister Julie loves to write because she has had several short stories published.

4. Use a semicolon.
   My sister Julie loves to write; she has had several short stories published.
5. Use a semicolon and a conjunctive adverb with a comma. The most common conjunctive adverbs are the following: 
   • consequently: shows a cause/effect relationship
   • furthermore:  indicates an additional example, proof, or clarification
   • however:  shows an opposing view
   • in fact: introduces a clarification or additional proof
   • indeed: provides stronger clarification or proof
   • moreover: introduces an additional clarification or additional proof
   • nevertheless: similar to “however”; must be used with opposing notions
   • then: because
   • therefore:  shows consequence

   My sister Julie loves to write; in fact, she has had several short stories published.