Complex sentence: In 2012, Madagascar experienced an "upsurge" in Malagasy migratory locust ("Locusta migratoria capito ") populations, leading to the country issuing a"locust alert" in November, indicating that conditions were right for swarming of the pest insects.
Split into simpler sentences: In 2012, Madagascar had an upsurge in the size of its Malagasy migratory locust ("Locusta migratoria capito ") populations. In November of that year, the government issued a"locust alert", saying that conditions were right for swarming of the pest insects.