My name is Suzuki, the former sales section chief, but I'm now head of the planning department.
Udukikai, formally known as Yayoikai will be held next April.
最初の例文の場合は、次のように言うのが自然な感じで良いでしょう。
ーMy name is Suzuki, the former sales section chief, but I'm now head of the planning department.
「前営業係長、現企画課長の鈴木と申します」
ーUzukikai, formally known as Yayoikai will be held next April.
「弥生会改め卯月会は来年の4月に開催されます」
この場合、B, formally known as A を使って「A改めB」のように言えます。
ご参考まで!