To move a huge pool (Great Vowel Shift), which began in the South of England in the 15th century, is one of the historical events which mark the birth of a new English language from English: intermediate.
Promoted in a big pond (Great Vowel Shift), which began in the south of England in the 15th century, is one of the historic event, which marks the birth of a new English from Middle English.
Moving big pool (Great Vowel Shift) which began in the south of England in the 19th century 15 is one of the historical events, which is the sign of the birth of a new English from English medium.