Question

Is this grammatically correct: In October, 1347, after decades of trading the most luxurious goods, trading ships sailed into the port of Messina, Sicily, carrying a terrifying cargo--the disease now known as the bubonic plague, the infamous plague in which caused an estimated 25 million Europeans to die, about one-fourth to one-third of the population.

Answer 1

Technically, it's correct. However, it's much too long and convoluted. You should rewrite it as two or more sentences.

Answer 2

In October, 1347, after decades of trading the most luxurious goods, trading ships sailed into the port of Messina, Sicily, carrying a terrifying cargo--the disease now known as the bubonic plague. This infamous plague caused an estimated 25 million Europeans to die, about one-fourth to one-third of the population.

Answer 3

That's much better.