I didn’t see a divorce record. You might find something in a local newspaper. It was the first marriage for each.
Lillie Smith and William Campbell were married 21 October 1896 in Lapeer, Lapeer, Michigan. Michigan, Marriage Records, 1867-1952 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2015. Michigan Department of Community Health, Division of Vital Records and Health Statistics; Lansing, MI, USA; Michigan, Marriage Records, 1867-1952; Film: 57; Film Description: 1896 Hillsdale - 1896 Montmorency. Record number 1446.
It looks like William Campbell remarried in 1903, his second marriage.
Michigan Marriages, 1868-1925," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:N3DZ-QNS : 10 March 2018), Wm Campbell and Della Ferguson Swain, 18 Mar 1903; citing Attica, Lapeer, Michigan, v 3 p 27 rn 3111, Department of Vital Records, Lansing; FHL microfilm 2,342,664.