Read the sentence.

based on the scientists’ recommendations, the new safety requirements were enacted.

which revises the sentence to create a new, complex sentence?

based on the scientists’ recommendations, the new safety requirements were enacted, and fewer accidents occurred.
many accidents occurred, so based on the scientists’ recommendations, the new safety requirements were enacted
based on the scientists’ recommendations, the new safety requirements were enacted so that the number of accidents diminished.
people were concerned by the number of accidents, so based on the scientists’ recommendations, the new safety requirements were enacted.

nature versus humanity!

21 balloons is the story of professor william sherman's travels.

in 1883, he set off from san francisco for a balloon ride over the pacific and was found a month later floating with 21 balloons in the atlantic ocean. this seemed an astounding feat and everyone wanted to know what had happened.    

professor sherman was loyal, however, and said he would tell his tale first to the western american explorers club in san francisco, of which he was a member. this built up suspense for several chapters before he began to tell of the wonders of his adventures and the amazing island of krakatoa, an island which had just been blown up by a volcano.  

the residents of krakatoa are all millionaires who live under a "gourmet government" of their own devising. we get to see all the incredible adventures that creative people with unlimited resources would create according to the author.