Complex sentence: The spontaneous agitation of the migratory birds reaches to its climax in December, January and throughout the season, these birds make their presence felt with the melodious singing and chirping over the placid water bodies.
Split into simpler sentences: The spontaneous agitation of the migratory birds reaches its climax in December, and January. Throughout the season, these birds make their presence felt with their melodious singing and chirping over the placid water bodies.