Complex sentence: In April 1991, the Manitoba CoR changed its name to the "Manitoba Reform Party" after a mail-in referendum among party members conducted in March and April, in which 67% of the respondents were said to have favoured the change.
Split into simpler sentences: In April 1991, the Manitoba CoR changed its name to the "Manitoba Reform Party". This followed a mail-in referendum among party members conducted in March and April, in which 67% of the respondents were said to have favoured the change.