This part of the sentence is correct and usable in written English.
It is usually used to express the possibility of something happening multiple times, or to describe a situation of multiple occurrences. Example: Heavy rainstorms may occur many times throughout the rainy season.
Mesothelioma, a cancer of the pleura, may occur many years after inhalation of asbestos fibres (see below Asbestosis and mesothelioma).
During a transient simulation, data transfer may occur many times, with the potential of error accumulation at each transfer.
Risky activities, such as collecting ballast water in one port and dumping it in another, may occur many times before an invader becomes established.
In rare cases, seizures may occur many years later in apparently healthy distemper dog survivors.
Pancreatic relapse may occur many years following nephrectomy.
However, metastatic relapse may occur many years after primary tumor diagnosis and surgical resection (Uhr & Pantel, 2011).
Finally, varicella vaccination started in 1999, thus we have not had opportunity to observe varicella breakthrough cases that may potentially occur many years after vaccination.
Finally, parasites may have very specific host resource requirements, but if those resources are evolutionarily conservative traits of hosts, they may occur in many host species in many different places.
'Functional' inactivation, which is the key concern with p53, may occur at many levels and with cross-talk between many pathways.
It can be shown [20] that if relaxation of the excited emitters to the ground state may occur through many competing channels (for example the excited carriers may escape from nanocrystal to many different radiative or nonradiative centers), the relaxation function is given by stretched-exponential (Kohlrausch) function: n ( t ) n ( 0 ) = exp [ − ( t τ 0 ) β ] (2).
Speciation may occur in many ways.
