A because if you do not now what kinds of sharks are out there
"a. After the rain ended, the sky became blue" would contain an independent clause and a dependent clause, which makes it a complex sentence, since the latter half wouldn't be the same without the former half.
John and Abigail had an affair.
after several months Abigail is still in love with John, but John does not feel the same way he even said he would rather cut off his hand than to touch her. He clearly has no feelings for Abigail when Abigail goes as far as to accuse Johns wife of witchcraft in hope that she can replace his wife.
