Complex sentence: After acquiring Carter's Ink Company in 1975, Dennison made the business decision to discard all of Carter's records from the 1860s on, including all of Carter's meticulous ink research records.
Split into simpler sentences: After acquiring Carter's Ink Company in 1975, Dennison made the business decision to trash all of Carter's records from the 1860s on. Among the things destroyed unfortunately were all of Carter's meticulous ink research records.