$ sed -r 's/^([0-9, :-]+)[^ ]+ ([^.]+).*took ([0-9]+).*/\1\t\2\t\3/' <<< "$var"
2019-02-28 10:35:00,554 GeneralIORead 14531437
2019-02-28 10:35:01,064 RC_562_GARANTIA_0KM 491317839
2019-02-28 10:35:01,168 RC_563_USO_COB_RCF_APP 102946319
2019-02-28 10:35:01,221 RC_564_FT_VEICULO_TRANSFORMADO 52461068
2019-02-28 10:35:01,232 RC_633_FT_AUMENTO_COBERTURA 9725119
2019-02-28 10:35:01,254 GeneralIORead 21085913
2019-02-28 10:35:01,260 RC_650_AGRAVO_PESSOA 4810285
2019-02-28 10:35:01,264 RC_571_FT_DESPESA_ADMINISTRATIVA 3548648
Mas se tb existir <TAB> entre a data e a hora, seria:
$ $ sed -r 's/^([0-9-]+) ([0-9:,]+) [^ ]+ ([^.]+).*took ([0-9]+).*/\1\t\2\t\3\t\4/' <<< "$var"
2019-02-28 10:35:00,554 GeneralIORead 14531437
2019-02-28 10:35:01,064 RC_562_GARANTIA_0KM 491317839
2019-02-28 10:35:01,168 RC_563_USO_COB_RCF_APP 102946319
2019-02-28 10:35:01,221 RC_564_FT_VEICULO_TRANSFORMADO 52461068
2019-02-28 10:35:01,232 RC_633_FT_AUMENTO_COBERTURA 9725119
2019-02-28 10:35:01,254 GeneralIORead 21085913
2019-02-28 10:35:01,260 RC_650_AGRAVO_PESSOA 4810285
2019-02-28 10:35:01,264 RC_571_FT_DESPESA_ADMINISTRATIVA 3548648