original: eastman and kotik performed together extensively in the early to mid 1970s .
simplifications: eastman and kotik performed together extensively in the early to mid 1970s . eastman and kotik performed together a lot in the early to mid 1970s . eastman and kotik performed together over a long period of time in the early to mid 1970s . early and mid 1970s witnessed the combined and extensive performance of eastman and kotik eastman and kotik performed together extensively in the early to mid 1970s . eastman and kotik performed together a lot in the early to mid 1970s . eastman and kotik performed together largely in the early to mid 1970s eastman and kotik performed together in a widespread way in the early to mid 1970s .