Original sentence: In 1955, the BWI$ was decimalized and coinage was issued in the  name of the "British Caribbean Territories, Eastern Group".In 1965, the East Caribbean dollar (EC$) replaced the BWI$ and circulated in British Guiana for a year until, following independence in 1966, the Guyanese dollar was introduced, replacing the East Caribbean dollar at par.Paper money production specifically for British Guiana ceased in 1942 and local notes were replaced by BWI$ notes in 1951.The dollar unit was equivalent to 4 shillings 2 pence sterling and replaced the guilder at a rate of 1 dollar = 3⅛ guilder.The rationale behind this lies in the fact that the dollar unit of account acted as a convenient intermediatory conversion unit between sterling and the outgoing Guilder unit.These territories were formally ceded to the United Kingdom in 1815 and united into the colony of British Guiana in 1831
Edited sentence: Spanish, Mexican, and Columbian silver dollars continued to circulate alongside the British sterling coinage until 1876 when these dollar coins were demonetised.The dollar unit of account therefore acted as a convenient intermediatory conversion unit between sterling and the outgoing guilder unit.The dollar unit was equivalent to 4 shillings 2 pence sterling and replaced the guilder unit at a rate of 1 dollar = 3⅛ guilder.The rationale behind this lies in the fact that Spanish silver dollars were already circulating alongside the Dutch coinage, and also widely throughout the Eastern Carribean.These territories were formally ceded to the United Kingdom in 1815 and united to become the colony of British Guiana in 1831