Complex sentence: In the mid- 1870s, Bass, Ratcliff and Gretton accounted for one third of Burton's output, a strong export business allowing Bass to boast their product was available "in every country in the globe".
Split into simpler sentences: In the mid- 1870s, Bass, Ratcliff and Gretton accounted for one third of Burton's output. A strong export business allowed Bass to boast their product was available "in every country in the globe".