The phrase "a massive complex and" is grammatically correct and can be used in written English.
It can be used when describing something that is large and intricate, typically followed by additional information or details.
Example: "The city features a massive complex and a variety of recreational facilities that cater to all ages."
Alternatives: "a large structure and" or "an extensive system and".
This is a massive, complex project and I could work 24 hours a day and never feel finished.
The centre of the company lay at the New Hartford Works in Werneth, a massive complex of buildings and internal railways on a site overlooking Manchester.
Instead, the ark serves as a school for the learning of compassion and care, a massive, complex laboratory for the exploration and realisation of hospitality.
Seoul is building a Design Plaza – a massive complex of museum, gallery and event spaces designed by Zaha Hadid that is intended to underpin South Korea's determination to assume the leadership of the consumer electronics and car markets.
Though he's the only one of the trio still alive, Heizer does not appear in any new footage, as he is very much hard at work on City, a massive complex of rock, earth and cement in the Nevada desert that, when it is completed, will be among the largest sculptures ever built.
A spokesman for Mulago Hospital, Enock Kusasira, confirmed that there were problems, noting that it is a massive complex open to the public and teeming with 7,000 people on any given day — 5,000 patients and their relatives, and 2,000 employees.
In addition, exhibition planners hoped visitors would understand that research on the Tree of Life is a massive, complex undertaking requiring powerful computers and that Tree research has many potential practical applications.
Mr. Cady made no little plans and conceived a massive complex similar to the first part, but in movie-style Romanesque, with great sweeps of pink granite dotted with turrets, tourelles and other castlelike features.
A massive complex that towers over the picturesque and carefully maintained park it sits within.
The courtroom, a low squat sand-coloured building inside a massive complex festooned with machine guns, armoured cars and black-uniformed armed police, had tight security.
