The split in the Ahmadiyya movement happened in 1914, however, the split started in 1909. Noorudin was on his death bed by the winter of 1911, and wasn’t able to control all of the Ahmadi’s anymore. He made some negative comments about Khwaja Kamaludin over the years, however, he also made some positive comments. They are in the below..
In a letter to Khwaja Kamal-ud-Din, dated 19th December 1913, he writes:
“Each and every hair of my body is pleased with you and is engaged in prayer for you.”
In the last of his Friday khutbahs which he was able to deliver, Khalifa 1 defended Khwaja Kamal-ud-Din against the supporters of your Khalifa 2 and said:
“You think ill of others. Khwaja Kamal-ud-Din does not work out of hypocrisy. He works only for Allah. This is my belief about him. Of course, he can make mistakes. I am happy with his works. There is blessing in them. Those who spread mistrust about him are the hypocrites.” (17 October 1913)
“Kamal-ud-Din is a good man. He is doing religious work…. He is engaged in a good work. None of you can compete with him. … Can any of you do the work which Kamal-ud-Din is doing?” (7 November 1913)
More generally, in June 1912 he declared in a speech in Lahore to these critics (supporters of Khalifa 2):
“You should first of all try to make yourselves sincere as they are. The people of Lahore are sincere. They love Hazrat [Mirza Ghulam Ahmad] sahib.”