you need a verb. Coca Cola, begun in an Atlanta drugstore in1888, remains a powerful beverage company which is merging with numerous smaller food producers. Also, it would be better to say Coca Cola, which began in an Atlanta drugstore ....

Coca-cola, begun in an Atlanta drugstore in 1888, remains a powerful beverage company which merging with numerous smaller food producers. Coca Cola , which started out as a sinlgle drugstore in Atlanta in 1888 , became a dominant berverage company by merging with numerous smaller food producers. which merging > which merging is not right . Which+ verb*ing* XX This company ,which is going to merge with company B , will .... The merging of these 2 companies , which has brought many benefits , will ........