to4kawa,
I believe you are correct. I had copy + pasted from a text editor previously that was formatting for json. The raw log is below.
Also after looking at the events further I believe they need to be broken at the initial "id" field that specifies a 5 digit number afterwards. I see that "id" shows up as another nested field multiple times but it appears the 5 digit number is the audit change number.
{"offset": 0, "limit": 1000, "total": 490, "records": [{"id": 17812, "summary": "User created", "created": "2020-03-27T20:58:22.837+0000", "category": "user management", "eventSource": "", "objectItem": {"id": "qm:6d90bc78-fd3b-4401-8720-31989454f2b7:d583e9f8-94b1-4ad1-aa5a-67c35ecfd480", "name": "qm:6d90bc78-fd3b-4401-8720-31989454f2b7:d583e9f8-94b1-4ad1-aa5a-67c35ecfd480", "typeName": "USER", "parentId": "10000", "parentName": "IDP Directory"}, "changedValues": [{"fieldName": "Active / Inactive", "changedTo": "Active"}], "associatedItems": [{"id": "qm:6d90bc78-fd3b-4401-8720-31989454f2b7:d583e9f8-94b1-4ad1-aa5a-67c35ecfd480", "name": "qm:6d90bc78-fd3b-4401-8720-31989454f2b7:d583e9f8-94b1-4ad1-aa5a-67c35ecfd480", "typeName": "USER", "parentId": "10000", "parentName": "IDP Directory"}]}, {"id": 17811, "summary": "User added to group", "created": "2020-03-27T19:03:08.067+0000", "category": "group management", "eventSource": "", "objectItem": {"name": "system-administrators", "typeName": "GROUP", "parentId": "10000", "parentName": "IDP Directory"}, "associatedItems": [{"id": "5be151ae92e2727e0939e20a", "name": "5be151ae92e2727e0939e20a", "typeName": "USER", "parentId": "10000", "parentName": "IDP Directory"}]}, {"id": 17810, "summary": "User added to group", "created": "2020-03-27T19:03:08.063+0000", "category": "group management", "eventSource": "", "objectItem": {"name": "site-admins", "typeName": "GROUP", "parentId": "10000", "parentName": "IDP Directory"}, "associatedItems": [{"id": "5be151ae92e2727e0939e20a", "name": "5be151ae92e2727e0939e20a", "typeName": "USER", "parentId": "10000", "parentName": "IDP Directory"}]}
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