Complex sentence: Breaks are inserted in the tracks, usually around a hole but with care, it is possible to break between holes to allow for components that have two pin rows only one position apart such as twin row headers for IDCs.
Split into simpler sentences: Breaks are inserted in the tracks, usually around a hole. With care, it is possible to break between holes to allow for components that have two pin rows only one position apart such as twin row headers for IDCs.