import re
sentence='<30>Jan 11 11:45:50 test-tt systemd[1]: tester-test.service: activation successfully.'
chunks = sentence.split(': ', 1)
result = re.findall(r'[^][\s,<>]+', chunks[0])
result.append(chunks[1])
print(result)
aW1wb3J0IHJlCnNlbnRlbmNlPSc8MzA+SmFuIDExIDExOjQ1OjUwIHRlc3QtdHQgc3lzdGVtZFsxXTogdGVzdGVyLXRlc3Quc2VydmljZTogYWN0aXZhdGlvbiBzdWNjZXNzZnVsbHkuJwpjaHVua3MgPSBzZW50ZW5jZS5zcGxpdCgnOiAnLCAxKQpyZXN1bHQgPSByZS5maW5kYWxsKHInW15dW1xzLDw+XSsnLCBjaHVua3NbMF0pCnJlc3VsdC5hcHBlbmQoY2h1bmtzWzFdKQpwcmludChyZXN1bHQp
['30', 'Jan', '11', '11:45:50', 'test-tt', 'systemd', '1', 'tester-test.service: activation successfully.']