You can find full translations and digitized versions of this volume on platforms like Archive.org , often featuring the translation by Aisha Bewley detailed analysis
Depending on the manuscript, this is likely ‘Abd al-Rahman ibn ‘Abd al-‘Aziz al-Ansari (a judge in Egypt). He is considered saduq (truthful) but not thiqah (precise) by some; others accept him. Not a major problem. tabaqat al kubra. vol. 3 pg. 269 h. 3714
of the Tabaqat al-Kubra is more than a citation; it is a window into the social reality of the early Muslim community. Whether detailing the famous "three men per camel" ratio or the individual bravery of a tribal leader, Ibn Sa‘d provides the raw material of history. You can find full translations and digitized versions