Complex sentence: Booth was particularly interested in birds, and it was his ambition, though not fully realised, to collect examples of every British bird species that existed, each species collected would include a male, a female, a juvenile and any plumage variations.
Split into simpler sentences: Booth was particularly interested in birds, and it was his ambition, though not fully realised, to collect examples of every British bird species that existed. Each species collected would include a male, a female, a juvenile and any plumage variations.