I recently came across the 1880 Bates county Mo census and it shows an H.W. Ackerman and wife S.E. living in New Home twp.
Charles at age 22 is with them and C.H. (Clarence) age 26 is next door with his new wife and family.
Most of the information in this census matches what I know about my family but conflicts with the information I received from you.
It's possible that I am trying too hard to connect the wrong Henry Ackerman and Sarah Sims. Your Sarah I know was born in PA. This census shows Henry's wife (now not even sure her name was Sarah) was born NC and Henry b. Ohio (1900 census shows him b. Illinois).
It does, however, show both Clarence and Charles b. Illinois so they were there as early as 1854.
If you come across anything that places your Henry and Sarah in Bates county Mo, let me know, and I'll keep digging.