Answer:
The given sentence contains a comma splice error, which occurs when two independent clauses are joined by a comma without a coordinating conjunction or appropriate punctuation mark. In this case, the comma is not strong enough to separate the two independent clauses, and a coordinating conjunction (such as "but" or "and") should be used instead or the comma should be replaced by a semicolon.
A corrected version of the sentence could be: "Baseball is easy to learn, but it is difficult to master."
Step-by-step explanation: