What is curious about the following sentence?

Lim Jia wrote:I do not know where family doctors acquired illegibly perplexing handwriting; nevertheless, extraordinary pharmaceutical intellectuality, counterbalancing indecipherability, transcendentalizes intercommunications' incomprehensibleness.

Spoiler:

Each word of the sentence below is one letter longer than the previous word.

Lim Jia wrote:Dennis, Nell, Edna, Leon, Nedra, Anita, Rolf, Nora, Alice, Carol, Leo, Jane, Reed, Dena, Dale, Basil, Rae, Penny, Lana, Dave, Denny, Lena, Ida, Bernadette, Ben, Ray, Lila, Nina, Jo, Ira, Mara, Sara, Mario, Jan, Ina, Lily, Arne, Bette, Dan, Reba, Diane, Lynn, Ed, Eva, Dana, Lynne, Pearl, Isabel, Ada, Ned, Dee, Rena, Joel, Lora, Cecil, Aaron, Flora, Tina, Arden, Noel, and Ellen sinned.

Spoiler:

If you start spelling the sentence backwards, you end up with the original sentence! That is because the sentence below is a palindrome. A palindrome is a word or sentence that reads the same backward and forward.

Lim Jia wrote:A big cuddly dog emitted fierce growls, happily ignoring joyful kids licking minute nuts on pretty queer rotten smelly toadstools underneath vampires who x-rayed young zombies.

Spoiler:

Each word of the sentence below starts with the next letter of the alphabet.