Complex sentence: Initially the British were based in and around the city of Hooghly like traders from other countries but in 1690 Job Charnock decided to shift the British trading center from Hooghly-Chinsura to Calcutta.
Split into simpler sentences: Initially the British were based in and around the city of Hooghly like traders from other countries. In 1690 Job Charnock decided to shift the British trading center from Hooghly-Chinsura to Calcutta.