Complex sentence: It was built for Ismay, Imrie and Company shipping company, which later became the White Star Line, after it amalgamated with Cunard the headquarters remained at Albion House until 1927.
Split into simpler sentences: It was built for Ismay, Imrie and Company shipping company, which later became the White Star Line. After it amalgamated with Cunard the headquarters remained at Albion House until 1927.