Complex sentence: TAG Heuer was formed as a subsidiary in 1985 when TAG bought Heuer, a renowned watchmaker specializing in racing chronographs.They modernised the product line and became one of the biggest names in Swiss watches.
Split into simpler sentences: TAG Heuer was formed as a subsidiary in 1985 when TAG bought Heuer, a renowned watchmaker specializing in racing chronographs. Together they modernised the product line and became one of the biggest names in Swiss watches.