What does "no account shall be taken of any period during which the House referred to...is prorogued or adjourned for more than four consecutive days" mean?
This phrase means that when calculating the time period of six months mentioned in clause (1), any time during which the House referred to in sub-clause (c) is closed for four or more consecutive days, either by prorogation or adjournment, should not be counted. In other words, only continuous periods of functioning without significant interruptions are considered when determining whether six months have passed since a Bill was received by the second House from the first one.