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perl -ne '$string=$_ if /Successfully sent/;  END{print $string}' $log
+file

2017-11-02 12:08:11,120 INFO [Timer-Driven Process Thread-8] o.a.nifi.
+remote.StandardRemoteGroupPort RemoteGroupPort[name=Receiver,targets=
+https://host.sub.domain.tld:9443/nifi] Successfully sent [StandardFlo
+wFileRecord[uuid=xxxxxxxxxxxx,claim=StandardContentClaim [resourceCla
+im=StandardResourceClaim[id=xxx, container=default, section=xxx], off
+set=384244, length=163820],offset=0,name=xxxxx.json,size=163820]] (15
+9.98 KB) to https://host.sub.domain.tld:9443/nifi-api in 242 millisec
+onds at a rate of 660.28 KB/sec

perl -ne '$string=$_ if /Successfully sent/;  $string =~ /^(.*) INFO.*
+$/; END{print $1}' $logfile