Final answer:
The sentence has a grammatical error called a run-on sentence. This is due to the lack of correct punctuation or conjunction connecting two or more independent clauses. The sentence can be corrected using a semicolon, period, or a comma with conjunction.
Step-by-step explanation:
The sentence 'The boss thought the assigned task was relatively easy the employee thought it was extremely difficult.' has a grammatical error known as a run-on sentence. This error occurs when two or more independent clauses are connected without the correct punctuation or conjunction. In this case, the two independent clauses are 'The boss thought the assigned task was relatively easy' and 'the employee thought it was extremely difficult.' It would have been correct if a comma and conjunction, or a semicolon or period, had been used to separate these.
For instance, the corrected sentence could read: 'The boss thought the assigned task was relatively easy; the employee thought it was extremely difficult.' Or 'The boss thought the assigned task was relatively easy, but the employee thought it was extremely difficult.'
Learn more about Run-On Sentence