Refactor SimpleStatement class in knowledge_data_access_layer.py #3016

Job	Run time
env	1s
changes	2s
gatekeeper	3s
documentation	0s
windows	0s
ubuntu	0s
mac	0s
guitest	0s
application_tester	0s
pytest	0s
coverage_draft / generate and upload	4m 51s
guitest_draft / run (windows-latest)	2m 59s
application_tester_draft / run (ubuntu-latest)	4m 5s
scripttest_draft / run	1m 55s
	13m 56s

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