Complex sentence: In 1976 Carena acquired a 25% equity interest and effective voting control of Trizec; the holding was increased to 50.1% later in the 1970's.
Split into simpler sentences: In 1976 Carena acquired a 25% equity interest and effective voting control of. Carena's holding in Trizec was increased to 50.1% later in the 1970's.