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Question:

What is the best way to combine these two sentences? "The Titanic was considered an unsinkable ship. On April 15, 1912, it hit an iceberg in the Atlantic Ocean and sank."

A The Titanic was considered an unsinkable ship, but on April 15, 1912, it hit an iceberg in the Atlantic Ocean and sank.
Explaination

These two independent clauses can best be joined by a comma and a coordinating conjunction.