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please tell me, are these sentences gramatically correct?
Ivanov is the author for more than 500 scientific articles both in domestic and foreign journals.
Ivanov was an expert with encyclopedic knowledge in the field of nematology and plant protection; passion for creation was an integral part of his life.
Prominent nematologists from all continents consulted with him from 1960s and until the end of his life.
Ivanov is the author of more than 500 scientific articles both in domestic and foreign journals.
Ivanov was an expert with encyclopedic knowledge in the fields of nematology and plant protection; passion for creation was an integral part of his life.
Prominent nematologists from all continents consulted with him from the 1960s until the end of his life.
Are these sentences gramatically correct? 
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