Complex sentence: The KDP10 in the service bureau was updated in situ, as the system was built with RCA germanium transistors, part of the update was to convert the main logic with what were probably cheaper silicon transitors.
Split into simpler sentences: The KDP10 in the service bureau was updated in situ, as the system was built with RCA germanium transistors. Part of the update was to convert the main logic with to silicon transitors.