The tidal cycle is the high tide followed approximately 6 hours later by low tide (two highs and two lows per day).
(The tidal cycle; is; the high tide followed approximately 6 hours later by low tide (two highs and two lows per day)) (the high tide; followed; T:approximately 6 hours later)
The tidal cycle the high tide
is followed
the high tide followed approximately 6 hours later by low tide (two highs and two lows per day)
T:approximately 6 hours later