Sleep help

My daughter is 10 months old and almost every night of her life I have put her to bed and down for naps bc she nursed to sleep. Most nights she doesn’t nurse to sleep anymore I rock her after nursing and she falls asleep. (She’s never been a good sleeper so I do what I can to get her to fall asleep) anyhoo I am going back to work soon and her dad is going to havta put her down to sleep soon and anytime we’ve tried to have him rock her to sleep or just lay with her she won’t go to sleep. She just crys forever and ever . Does anyone have any suggestions on how we can get her to fall asleep without me there ?