Complex sentence: In his leisure, John Fothergill made a study of conchology and botany; and at Upton, near Stratford, he had an extensive botanical garden where he grew many rare plants obtained from various parts of the world (now West Ham Park).
Split into simpler sentences: In his leisure, John Fothergill made a study of conchology and botany. At Upton, near Stratford, he had an extensive botanical garden where he grew many rare plants obtained from various parts of the world (now West Ham Park).