Add spaces: Iftheydonotreturntotheonlinebackgammongamethenyoucansendamessage.

Answer: If they do not return to the online backgammon game then you can send a message.

Add spaces: Vulture,ElectroandDocOckhavetakenoverarooftop!

Answer: Vulture, Electro and Doc Ock have taken over a rooftop!

Add spaces: InSriLanka,Buddhismhasbeenaroundthelongestwithoutabreak.There,Theravadathrivedforover2000years.

Answer:
In Sri Lanka, Buddhism has been around the longest without a break. There, Theravada thrived for over 2000 years.