Take another look at the original sentence:

The terrified passengers aboard the 747 gripped their armrests as the jet bucked in a bad stretch of turbulence after a ride like this one, everyone knew that five minutes on Disney's Space Mountain would feel like relaxing in a rocking chair.

You chose to fix it the correct way:

The terrified passengers aboard the 747 gripped their armrests as the jet bucked in a bad stretch of turbulence. After a ride like this one, everyone knew that five minutes on Disney's Space Mountain would feel like relaxing in a rocking chair.

The terrified passengers aboard the 747 gripped their armrests is a main clause. After a ride like this one, everyone knew is the second main clause. You are always correct when you use a period between the two main clauses that create the fused sentence.

Go to the next sentence.

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