Complex sentence: When the hotel first opened, private rooms cost $2 a night; 155 of the 350 bedrooms featured a private bath while the other 104 rooms had washstands with hot and cold water connections.
Split into simpler sentences: When the hotel first opened, private rooms cost $2 a night. Of the 350 bedrooms, 155 featured private baths, while another 104 rooms had washstands with hot and cold water connections.